Chevy rear end gear ratio chart Feb 9, 2012 · The easiest way to determine your final drive or gear ratio is to look at your RPO codes. 17" Blade Silver Metallic Aluminum Wheels 3:42 Gear G80 Auto. more teeth the larger the diameter pinion. 27 = 10. I think it is an 8. Apr 15, 2017 · It was the original 6 cyl/2 spd trans rear end. To find the axle gear ratio of any GM vehicle, locate the RPO sticker (typically located in the glove box) and write down any codes starting with F, G, or H. Example of an axle differential inspection cover. Aug 20, 2009 · Mine shows the code as the same for all the years mentioned. 78 2. 88:1 gear set. Apr 11, 2017 · Ok this is purely for a little math problem I am working on. 73:1 to a 4. Don't want to go there. Rear Axle No. 1 ©2003-2006 InteractivePHP, Inc. Jun 12, 2011 · Pulling the cover is the guaranteed way to find out what you have. 55/close combination for the first two gear changes. Dec 14, 2005 · Gear Ratio Inside your glove compartment door there is pasted the Service Parts Identification label. All GM 10-bolts are stamped with the ratios in the form of tooth-count. 11 MPH Feb 15, 2019 · 2019 Chevy Silverado 1500 LT Z71 4x4 crew cab, 5. 50ish gear with the close ratio in first gear. Need speed, RPM, tire size and tranny gear ratio. Your vehicle will probably run at different RPM’s than those you calculate. 73:1. So now I'm more confused than ever. 07:1 ratio, August 24, 1967, Buffalo plant. 36 Gear MPH 3. Even the standard 2. 41 ratio GM8-2. If you want to know how to do this, we detail exactly how you can decode a VIN plate and learn the gear ratio of your vehicle. These RPO codes are used to idicate a specific type of differential and/or ring gear size. Jun 27, 2014 · The standard axle ratio for Chevrolet pickup trucks is chosen to balance performance, capability and fuel economy, according to the company. Just divide the small number into the larger number. Ring and Pinion Repair and GM RPO Codes chart. 64. 5-inch rear end. 64 MPH 191. Enter the maximum potential safe engine RPM. 73 gear ratio (41/11 =3. 5in 10 bolt axle The list below is a partial list of typical GM RPO Codes, specifically the codes pertaining to Axle Identification, Differential Type and Gear Ratio. If you can read the stamped alphanumeric characters stamped on the rear end axle housing, you can look up your rear end gear ratio here. 1957 1st Design (On Toe Panel) 1955-66 3-Speed Overdrive No. RPO code can be found on the driver-side door panel or glove box. on the other hand if I :welcome: used the 350TH I need to change the rear Need to know what rear end gear ratio's came in the 58 Apache 3100? I rotated the rear wheel 0ne full turn and got one and three quarter turn on the pinion, which doesn't seem correct. The Gear Ratio Calculator will determine the ratio of a gear set, based on the number of teeth on the ring gear and teeth on the pinion gear. Jan 30, 2015 · Try find an axle that has the ratio you want as it will be much cheaper and easier than buying one that needs a gear ratio swap. 7 vortec vin R. Three ratios is what I find GT4 Rear axle, 3. 73 for a Z51 However when at the dealer just yesterday ALL 11-19-09 12:14 PM - Post# 1808679 In response to 62BelAir personally I think you would be far ahead to just find and install a complete rear differential in the car rather than trying to rebuild the old one, and filling it with new synthetic fluid after a good inspection and flush of the old lubricants,simply because there seems to be more than one problem, with the original rear differential Aug 29, 2012 · i have just purchased a 2010 silverado and would like to know how to read what the vin number means and how do i find out what my gear ratio is in the rear end. 2L 2wd. 2-inch 10- and 12-bolt axles, while the other divisions used various other axle designs, including one 8. 53 for a base model 2. Knowing your rear end’s gear ratio is crucial when you are considering a transmission upgrade, needing to calibrate the speedometer gear in your transmission, selecting the proper gear sets in a transmission, or even getting professional help with a new axle ratio for your application. Using the charts below, you will be able to learn alot about the rear differential in your classic full size Chevy. Click “Calculate Gear Ratio”. 42:1. 01 13% 2nd 1. 10 RATIO GU4 -- AXLE REAR, 3. 06, that combined with your 3. 08s would be like having a 3. 08 RATIO GU5 -- AXLE REAR, 3. 10 ratio GU6 Rear axle, 3. 25. 3 Vortec and I'm trying to figure out what gear ratio it has. 73 (optional performance axle) gives an overall first gear of 11. 36 open DB - 3. This calculator assumes you know the vehicle’s transmission ratio. 6" ring gear. 56 axle with the A6 gives an overall first gear of 10. Type 4 gear carriers are the thickest, and these units were available in several ratios, all 3. Note 1: Just what constitutes a 'small' ring gear or 'large' ring gear is uncertain. 73, etc. 5-inch is often referred to as the “GM corporate 10-bolt” because of its multiple uses, and the 8. "Why in the Hell can’t the Army do it if the Marines can; they are all the same kind of men, why can’t they be like Marines?" Oct 27, 2017 · Hey Greg, as long as it’s stock, it’s pretty straightforward. And it wouldn't even break the tire loose on a patch of ice. see if it has another "G" code listed. 98 first gear ratio [3. 73 - up (larger numerically) Mar 25, 2010 · In the Z06 category, would a set RPM be cut in Half or Doubled EXACTLY if comparing 4th gear to 6th gear? For example (RPM Method) would 3000 RPM's @ 70 MPH in 4th gear (Gear Ratio 1. 70 gear in anything. When your chewing the pinion teeth off and it only has 9 teeth where as the other gear ratio has 12-13 teeth. This how to video is to help you Identify your GMC or Chevrolet rear end gear ratio by the GM RPO Code, which is in the dash glove box (Accurate identifi With such a low sales of ZQ9 in 1971, one can conclude the 302 sales must be for the 3. thanks again, once this Sep 23, 2018 · A larger ring gear will bolt on, but you will not be able to get the proper pinion bearing spacing no matter how many shims you use. 08:1, will provide better fuel economy but slower acceleration than a gear ratio that is numerically higher. 73 ratio GU4 3. Feb 21, 2023 · RPM's equals "speed in mph" times "trans gear ratio to two decimal places" times "rear gear ratio to two decimal places" times "a constant (336. Oct 25, 2023 · THe amount of theeth engagement is where the strength comes from. Write down that number. 3. This proportion is known as an axle ratio. 42:1,” or a “3. 23 3. I would like to get just a bit more pulling power with out pushing the RPM's up too much. My 85 4x4 also has disc brakes - the rear end was sourced from an early Bravada and all Bravadas had G80 units in them. 5 inch gear. D. 5 inches). There are three rear axle ratio RPO codes for the GM ST Truck line. It was custom built. I recently purchased a 56 210. ” Use our gear ratio calculator to find the effective gear ratio your vehicle will have with a new tire size. I was thinking about 4:11 gears, but, it seems many street cruisers are now using 3:73 or 3:55 ratios. 82 MPH 7000 RPM 182. 55(PG), 3. The gear ratio has been changed for a deeper gear when the car had about 30k, I assume that it was only the gear that was changed, not the whole axle. 73 ratio GT5 Rear axle, 4. Feb 29, 2004 · I have the 4-speed automatic with 3. 73 diff ratio: 813 (tire revs per mile) x 3. Gearing is what you are buying when you purchase a Gear Vendors Under/Overdrive. 2" Bilstein 5100's, LT275/70R18 Cooper AT3's. The first letter (A) is for the plant (Detroit Gear and Axle), and the B is the ratio (3. 08 open Jul 12, 2014 · For simplicity, I generally calculate at 60 mph - here's how the tire size/gearing/rpm formula pencils out for my current set up, and for the ratio changes I'm considering. Nov 19, 2013 · Rear Axle Ratio Charts For 1967 - 1972 GM Trucks The 1967 check the numbers on the ring gear and use the "Red" chart in post #2 Example: If the numbers 41 : 11 55-58 PSNGR REAR AXLE I. For a Ford 9 inch rear end, swapping differentials and 9 inch gears is fairly easy as it has a removable third member. Dec 24, 2020 · Before GM consolidated its rear-axle production into what became known as “corporate” axles around 1971, each division placed its own versions underneath the passenger cars it produced. Right down that RPM number. Dec 1, 2015 · For example, an axle with 41 ring gear teeth and 11 pinion gear teeth would have a 3. 14 ratio GH2-2. 73). 72 60ft Tire and gear ratio calculator rear end gear ratio and transmission to tell you exactly what RPM your engine Jun 18, 2018 · The difference between the series is the gear ratio each carrier can support. 5 inches, 8. 30 1. 55:1 AB BB Sep 24, 2020 · Rear Axle Gear Ratios. Apr 13, 2018 · Just like a 10-bolt rearend, there should be stamped numbers on the axle tube – on the passenger’s side. Finding Your Axle Ratio Vehicle Codes Method. 11, 3 and 3/4 turns would be a 3. 42 ratio GT4 3. Feb 22, 2020 · 47-55. 03, that combined with a 2. 73 - down (smaller numerically) Series 3 = 2. 66 3. Identifying the correct rear end code for your Chevrolet is an essential step in Jul 11, 2008 · I have a healthy SB400 and a wide ratio Muncie (M20) also, and the combo is just right for cruisin' and Interstate driving. The A6 has a first gear ratio of 4. These numbers refer to the number of times the driveshaft spins for every rotation of the tire when you are at 1:1. From what I recall that would give me a ratio of about 1. Press the Solve button and the ratio appears below. Fisher Body No. Find the perfect gear ratio to optimize acceleration, towing capability, and fuel efficiency. Other differentials include the full line of Eaton Tru-trac and clutch style differentials. 08:1 - Tooth Combination 37,12 Ratio 3. Charts showing rear axles offered Apr 14, 2021 · "The round disc/tag on 55-later rear ends (up through 64), is GEAR RATIO indicator. 42, or does the min or max number represent the ratio? This is from the decoder: Axle Ratio 1) - Rear 3. I have also listed a helpful gear to tire size chart to help people better understand. Only 1 wheels spins. Multiply that number by any speed, 50, 60, 75 etc. The gear ratio codes are located on the front passenger side of the differential as shown in the illustration below. GT4 = 3. 5in 10 bolt axle G89-7. 1 Changing Rear End Gears 1950 - The 1947 - Present Chevrolet & GMC Truck Message Board Network Register or Log In To remove these advertisements. I can't see the pinion to see if there are any numbers on it but if its a 9 tooth l would have a 3:55. Years ago, CCI published a list of all the 55-64 axle ratio codes. 10 ratio GQ1 Open Differential Rear Axle G80 GOV-LOC Rear Axle That's what the van was BUILT with. 73 (diff ratio) = 3032 (driveshaft rpm) x . Removed the drive shaft and plugged the tranny. Nov 11, 2015 · The 3. Now if they changed the axle ratio from 4. 73 and 4. 56, 4. , whereas “short” gears refer to the larger number gear ratios like 4. "Tall" gears and "short" gears are referring to the gear ratios. May 26, 2013 · I'm putting LS motor in my '57 Chevy pickup. Can someone tell me what gear ratio this rear end is? I cannot count the pinion gear without breaking the rear end down. 36). Then, find those codes in the table below. Mar 23, 2006 · In the 2006 model, GM evidently saw a least a glimmer of light, and changed the internal gear ratios for all six gears to bring out more of the performance in the SSR! The 05 and 06 ratio comparison looks like this: Gear 05 model 06 model Percent Difference 1st 2. 08 gear ratio; GU6: 3. My truck is an 01 2. :werd: Jul 19, 2011 · So my rear end is making a loud whining noise and at certain speeds now some crazy rattle as well so its time to rebuild it. 29 ratio GU1-2. 41 to 4. 2 or 8. This rear end was available in a 10 bolt version only. 27 transmission first gear ratio multiplies providing a 10. 00, 3. Oct 30, 2006 · If you change the close ratio transmission to a wide ratio with those 3. 00 1. Or calculate the number. The code I'm referring to is stamped not cast, and it's on the passenger side of the 3rd member housing, midway up. 70(3sp), 4. 23 min 3. Axle Ratio: Enter Jun 2, 2023 · Understanding the different gear ratios for your chevy truck rear end is crucial. The ratio of a ring and pinion gear set is simply the number of ring gear teeth divided by the number of pinion gear teeth. You will have one and possibly two of the following codes if you have the G80 option. Axle Ratio Code Stamps. Low gear sets have more teeth on the pinion gear than high ratio gears do and as such the overall diameter of the pinion gear tends to change significantly across the scale of ratios. 10 bolts is for the I6 trailblazers and has an 8. 2007-2018. The standard ratio also is biased more toward fuel economy. What do gear ratios tell us? gear ratio: The number of rotations of the crank arms per revolution of the rear wheel. The stamped code tells BOTH the gear ratio and the plant. CW 0109B for 3. RIP OLDEERSLAYER 2000 Jimmy 4x4 4dr. You will not find a better calculator. 10 rear end gears. However, the smaller 10-bolt unfairly gained the reputation as a weak […] The various numbers that will allow you to identify your differential are highlighted in the photo below. 1987-1995 Dec 18, 2016 · I have the following information from the Chevrolet VIN Decoder. 10 to 3. 73, that wouldn't change the fact of the size of the rear end if its still 14 bolt. A Series 2 carrier will house gear ratios from 2. This is fully loaded with trans and rear gear ratios. Last, I have seen MANY 55 rearend cases that DO NOT have a casting date or a stamped code. Enter in your info: Transmission rear gear tire height desired shift point It will show you RPM's in every gear at any speed. Enter the tire size diameter and the target vehicle speed in MPH. 73 ratio GT5 4. I have dug around a bit, but cant really find a solid answer to my question. V8 Engine Number Series Year Transmission Ratio Detroit Buffalo Psngr 55-56 3-Speed 3. 50)? Or (MPH Method) 3000 RPM's @ 70 MPH in 4th gear equal 3000 RPM's @ 140 MPH in 6th gear? Feb 20, 2014 · The ring gear & pinion numbers should be stamped into the rear ring gear too. Dec 2, 2012 · Actually I misspoke a little. 76:1 through 3. A couple friends gave me these ratios since they knew I was going to the junk yard to get a differnt stock rear end for my car. 36 x 3. See chart below for carrier/case breaks by differential model. 34 MPH 151. 29:1 through 2. And with today's gas prices, I'm not interested dropping to a lower gear ratio. 41 for a Z06 2. 15 axle gives an overall first gear of 9. 76:1 up to 3. Jul 17, 2015 · GU2 2. Truck 12 Bolt Series 2 = 2. 79, 2. Contemplating changing my gear ratio from 3. 73 rear. 08/wide combination would feel the same as the 3. 31:1 ratio, January 9, 1968, Buffalo plant Apr 30, 2009 · Below are the stock gear codes found in the glove box. 25 MPH 173. Pick the tire hiegth, pick your gear ratio. 42 Series 4 = 3. The rear axle identification code consists of at least a two letter prefix indicating the gear ratio, a letter for the GM Division, and three digits indicating the day of the year from January 1. Here is a chart for them. Jun 7, 2024 · Rear-End / Differential Gear Ratio Calculator. The Ford 9-inch is the most desirable drag racing rear end because it has a removable carrier, which allows quick rear end changes. 1970-1972 rear end example. The rugged, reliable, and efficient Chevy 12-bolt has established itself as the preeminent rear differential for GM muscle cars since its debut in 1965. 11, 4. To know your Chevy’s rear-end gear ratio, check the table using your RPO code. G: Detroit Gear & Axle: K: McKinnon Industries (GM of Canada) W: Warren, MI. CF 0825B for Positraction 3. To use the calculator, count the teeth on each gear and enter them in the appropriate box. The reliability of the axle tube and bearing are really the only problem spots you are likely to encounter with the 8. The prefix is usually F, G or H when referring to Axle Identification. If you are having trouble finding a posi axle you could always install a lunch box locker that reuses the existing case. 41 and 2. First gear goes to 50 mph and second gear to 80. Chevrolet used its own 8. 11 its best for me to run 700R trans with the 4. Jeep Wrangler JL Showcase. 73 max Other transmission info from decoder: In other words, having the wrong gear ratio can turn your car into a complete and utter turd, or it can make it lightning quick off the line but no with top-end speed what so ever. . Lump Nov 1, 2018 · This calculator says 2950 rpm at 70mph with the 4:10 rear end, and 2500 rpm at 70mph with the 3:52 rear end. 255,000 miles Oct 23, 2023 · Alternatively, you can just find the gear ratio in your vehicle 17 digit VIN number. com Chevy Rear End Gear Ratio Chart. What rear end ratio are people using. I'm assuming it is 3. For instance, a high ratio is great for off-roading and low-speed maneuvers. See What gear ratio do I need in FAQ for a discussion on choosing a ratio. ‘6’ is the internal code for 10-bolt axle assemblies. Example; the original rear pinion gear on my k10 exploded, and it was cheaper to buy a parts truck with a good axle than to Jan 5, 2022 · I snooped on the Colorado forums today but couldn't come up with the info I was looking for. 10:1 ring gear. Oct 5, 2022 · The 8. 08:1 ratio available as an option with the base 307 V8 that came standard with a 2. 11 if that is the ratio your rear end uses). However, only experts are allowed to do this. 73 RATIO GT5 -- AXLE REAR, 4. Jan 5, 2018 · It also has a 9. Kinda ridiculous. Just download and run it in Excel. 73 GT5 = 4. But the SB400 has plenty of torque to make the M20/3. The rear end axle is responsible for transmitting power to the rear wheels in a rear-wheel-drive vehicle. If you are just swapping in the axle, nothing else needs to be changed, but the speedo gear, if the ratios are different. There were only THREE possible gear ratios in 56: 3. 11. In the case of an axle ratio with a value of 3. General Motors was good enough to put a sticker inside of your glove box with all of the production codes for the parts that were used to build your truck. Within these codes is one for the axle Nov 19, 2013 · Rear Axle Ratio Charts For 1967 - 1972 GM Trucks The 1967 check the numbers on the ring gear and use the "Red" chart in post #2 Example: If the numbers 41 : 11 Mar 13, 2018 · Originally, gear ratios ranged from 2. 23, to 3. Tall (high) gears have LOWER numerical numbers such as 2. A wide ratio and 3. Again, the car is a V6 model 3spd. Jun 25, 2010 · stock 58 apache rear end question The 1947 - 1959 Chevrolet & GMC found a chart to match up the serial numbers to find out my exact ratio. Axle ratios may be expressed in notation as something along the lines of “3. Because the pinion is smaller in diameter than the ring gear, the drive shaft will spin at a higher speed than the axle shafts and wheels. 68 MPH 7500 RPM 195. Jul 17, 2024 · Pro-Tip: The GM 10-bolt axle ratio codes vary by year, so creating a list of the ratios would take pages and pages. 1 Changing Rear End Gears 1950 The 1947 - 1959 Chevrolet & GMC Pickups Message Board 47-55. 10 ratio (4. (Accurate identification using the GM RPO code assumes that the rear end has not been previously modified) Sep 2, 2023 · Upgrade your Chevy’s rear-end gear ratio for improved performance using the comprehensive Chevy rear-end gear ratio chart as a reliable guide. May 18, 2012 · 2015 Chevrolet Colorado LT , Ext. Identify your GMC or Chevrolet rear end gear ratio by the RPO Codes, usually located on the placard labeled “Service Parts Identification” inside the drivers door panel or glove box. Gear ratio changes are possible as long as the ratio selected is within the range of ratios available for the carrier. I would like to pull about 1,300 lbs. Jeep Gladiator JT Showcase. 08s you can have more of a hole shot and still have the top end. 73 - up (larger numerically) Mar 10, 2017 · I have a 1994 Chevy W/T K1500 it has a 4. 10 gears. The results can be used in our Transmission Ratio RPM Calculator and RPM Feb 27, 2011 · My project car is a 1956 chevy 2-dr sedan. The gear ratio has a significant impact on a vehicle's acceleration and fuel efficiency. Pick your Chevelle's year from the menu bar and scroll down to that year's "Rear Axle Codes" link. If it was stamped BB, the first B would be for the Buffalo plant. 00) equal 1500 RPM's @ 70 MPH in 6th gear (Gear Ratio . It will be connected to a 4L80 and Dana 60. 70. If you were getting an automatic transmission, I would suggest the 4. Jun 1, 2008 · Your A4 has a first gear ratio of 3. From my own experiences the 3. Apr 20, 2017 · In this calculator, you can first figure you're tire size accurately, which will be used to determine your overall gear ratio. 90, 3. 08:1 - Tooth Combination 40,13 Ratio 3. 11s for the low end pull and the overdrive would keep the RPMs down on the highway. Rear Axle Ratios Ratio 2. You'll have to clean the area pretty thoroughly with solvent and a wire brush to see it. Not optional equipment, optional just the one that came most commonly when Joe blow went to the dealership 1964-1969 rear end example. Jeep Wrangler JK Showcase. 36 rear axle gear ratio coupled with the 3. GT4 -- AXLE REAR, 3. 73:1 axle ratio. Stamped Axle Code Location. My Chevrolet Parts and Accessories Catalog, circa 1972, only shows the gear ratio service part numbers so it is quite possible one or the other was discontinued in favor of a 'service' part. 10 rear creates a 10. Anyway, I think it has been established that the ratio in this truck is a 3. 10. Differential Identification Chart; Differences Between Limited Slip Differentials; Earl’s Differential and Manual Transmission Cooling Systems; How To Box-In a Differential / Solid Axle Rear-End Housing; How To Measure Differential Pinion Depth; How To Select Proper Rear-End / Differential Gear Ratio; Understanding How Differential Gears Work Unless driven gears with more than 45 teeth and / or drive gears with fewer than 15 teeth become available, it will be impossible without using a ratio adapter to have an accurate speedometer with rear end gear ratios lower (higher numerically) than 4. 31:1 ratio, August 25, 1967, Buffalo plant. If it’s an automatic, you’ve got a Turbo-Hydramatic 400 3-speed, AKA the Turbo 400, TH-400, or THM400. Re: 1983 4x4 gear ratio 12-26-04 07:32 PM - Post# 583307 In response to smallmouth If you pull the cover, the ring gear will have the ratio stampped on it. The … Continue reading GM Drive Ratios → Chevrolet truck VIN numbers deciphered. 31:1 - Tooth Example: BL 1122 G2 For a 68 or 69 model, this is interpreted as a 3. Find all of the gear ratios available for your vehicle in our Application Guides. 73 times to complete one revolution of the wheel. Alternatively, the GM rear end can be identified by the diameter of the ring gear (7. 1997-2006. See full list on toolsbible. The gear ratio of each overdrive gear of your transmission. But the 57 didn't come standard with a 3. 11 was the o/d gear. Chevy 10- and 12-bolt axle assemblies have been standard equipment on GM passenger cars, muscle cars, and trucks for decades. As for year of S10, I recommend finding one from the newer body style (1994 and newer) The newer brakes have a bolt-on wheel cylinder that is preferred over the earlier style that uses a ring retainer. 43 has a higher cruising speed and better fuel economy. I can explain how the constant is derived if you really want, but I suspect everyone's eyes would cross as you whisper "thank Jun 4, 2013 · T56 ratio chart Borg-Warner T-56 transmission - Wikipedia, the free encyclopedia Nice '57 , Here's a chart for you. 6 V6 DOHC 6 Speed Auto. 6" housing is a little bigger and has an extra gusset towards the front of the housing, IIRC. 5-inch is a semi-float axle, meaning it has only one axle bearing per side, mounted inside the axle tube. Lš&-; O fCcNµÞ¸uꉆ§Òpç3W)Ð8þ{Ufƒ¸ mÇ55q f2›³½²Ã8`Hº÷è Üm½ßÔ¯¼ÆâöÀð[XÍìÜy/‘ »v[t@$Ÿ õÈ– ÛÑ•Lan ¶€ë,l©kcï5z. 5 axle I have been told that model truck is geared low. The speed you want to drive at, usually 75mph . Jul 4, 2012 · They will be the same regardless of gear ratio as long as it's not a posi. Hers. Judging by the cover it looks to be a GM 8. Location: Main Index » Forum Index » Chevrolet Cars 1949-1954 » 1949-1954 Chevys » rear end gear ratios 49-54? FusionBB™ Version 2. Re: 57 Belair rear end ratio 11-19-03 07:21 AM - Post# 339374 In response to Chevy_Muscle Go to this webpage HERE for all the specs of these cars. (Pig only) I assume they gave me ratios that were offered from the factory between the years of 55 and 64 since I was looking in a old junk yard. Feb 23, 2004 · I have a 10 bolt GM rear end that I am trying to understand so I can determine how it is working with the rest of the drive train. Dec 5, 2018 · I have one truck with a 4. Mar 27, 2013 · A web based calculator to help you pick the right size tires, wheels, rear end, gear ratio and transmission for your 55-57 Chevrolet Bill 1957-427-177-6-410 This calculator will provide the speed of the vehicle based on transmission gear ratio, engine RPM, tire height, and the ring gear and pinion gear ratio in the rear end axle differential housing. Locking Rear with Tow Package 8" Mylink Entertainment Center GM Performance Exhaust GM Performance Intake Feb 19, 2006 · I puled the cover on the supposed 54 3:90 rear-end today and found a number 32 stamped on the ring gear and someone said if I divide the pinion teeth number into the ring teeth number I can get the ratio. Ÿ ¸Ým÷¾º¶T>û#MA¡œB³õÝV5 áÊÓ€#uWÀÄƤÆG a]{¾ãŸh. Decode them Here. 66 first and a 4. 76:1; a Series 3 carrier will house gear ratios from 2. 6" cover is deeper. Chart showing transfer cases offered and gear ratios. 73. Rear end gear ratios. The 3. 1953-56 Engine No. A (numerically) lower gear ratio, such as 3. If you go down to the table for Rear Axle Indentificaiton you will find the codes there that should help you find out what your rear end originally had. 75 which doesn't seem feasable. 00 so safe to assume 4. It has 41 teeth on the large gear. After driving about 20 miles, I stopped at an intersection and the rear end just locked up tight! Tires just barking. 07 combo work just fine. 42 ratio _____ Jan 17, 2017 · I have an '87 El C with 305ci and 2. 56 ratio GU2-2. 73 gears. The numbers should let you know what gear-ratio came from the factory, the date of production, where the unit was assembled, and whether the carrier is Positraction or not (see charts). Aug 8, 2017 · On the opposite side (right side) of the case is where letters-numbers are stamped which indicates the BUILD date of the rearend as well as the gear ratio. May 11, 2017 · C7 Tech/Performance - 2016/2017 Corvette REAR END RATIOS - I'm a bit confused as to what the rear end ratios are now for an auto trans Base model auto Z51 model auto Z06 model auto According to what I read they are either 2. Gear Ratio Tag Gear Ratio Code Assembly Date Casting Date Casting Number Gear Ratio The identification code will tell you the gear ratio, if it is a posi, and in some… Continue reading Differential Identification Codes Mar 7, 2012 · So for an easy one to start with, IF your driveshaft turns a hair over 2 times, (to be exact, it would be 2. As well, once you get your accurate tire diameter, you can enter that number into the provided fields and come up with a RPM based upon your Ring & Pinion, selected transmission gear and the speed your are moving. 39 MPH 141. Nov 23, 2017 · To identify the ring gear size, this chart, which identifies all GM diffs, will help: And Sparky added this: The covers on the GMT360 8. 6" rear are the same bolt pattern, but the 8. with a 283 engine I am not sure what is the gearing ratio is at this time the rear end is a gm A56 3707306 gm 11 not sure if this is a 4. Current setup - 3. 2018-2025. 00 0% Other differentials include the full line of Eaton Tru-trac and clutch style differentials. 98]. 73 gear ratio gives you a lot more acceleration and torque, the 3. Except for truck differentials with 30-spline axles, and those carrying 2. Crank no start chevy k2500 5. If you cannot find the characters stamped on the rear GM 4. The gear ratio determines how your truck will perform, from towing capacity to acceleration. 35, 3. In 1971, GM instituted a standardized "corporate" rear axle. GM RPO Codes, or General Motors “Regular Production Option” codes contain lots of valuable information about your GM axle. and 3. wheels). 07:1 axle ratio, non-posi, 12-bolt rear axle assembled on November 22, 67 or 68 by the Detroit Gear & Axle plant, second shift. The stock 7. Common axle gear set illustration. Sierra Gear & Axle parts are designed and engineered to the highest quality specifications for use in street, off-road and performance environments. 08 ratio GU5 3. 42 gear ratio; Conclusion. Vehicle No. Oct 18, 2023 · The Chevy rear end compatibility chart is a valuable resource as it outlines the rear end dimensions, including axle beam width, spline count, and gear ratios. 88 etc. 23 ratio GT4-3. 07 works out good as an all around good ratio in a 1/2 ton truck without an overdrive tranny. 73:1 - Tooth Combination 41,15 Ratio 3. Chevy II, Acadian owners and enthusiasts Jul 12, 2002 · According to my GM production options guide, dated nov, 1994 GQ1= axle std ratio. The rear above has AB stamped on it. 11(3spOD). 00. 1955-57 Powerglide and 1957-61 Turboglide Boss No. In the glove box it codes it as the GQ1 "standard rear axle ratio". I will be towing occasionally and need to be able to get a 3000LB trailer. As you've already been advised, pay attention to your total first gear ratio and have a custom driveshaft built to deal with the high driveshaft speed. 08 ratio GU5-3. Code: Assembly Plant: C: Buffalo, N. 4 1/10 turns would be a 4. 11 or what. Also, the 8. This is an example from a 1967 Chevelle and is stamped CB 1012 W. 73:1; and a Series 4 carrier will house gear ratios from 3. Jun 14, 2017 · Rear Axle Gear Ratios - Best for Towing: CascadeBob: Trailer Towing and Tow Vehicles Discussion: 41: 03-19-2017 10:53 AM: A class to C class rear axle ratios: opnroad: Class A Motorhome Discussions: 9: 02-28-2015 10:20 AM: Power to weight ratios and torque to weight ratios: Mystery: Newmar Owner's Forum: 8: 01-03-2013 06:16 AM: Rear end ratios Jump to: Driveshaft | decoding | ring gear identification | Speedo-gears Camaro Rear Axle Information The 1970 rear end differs from the 1971-1981 rear end. 30 MPH 162. 52 MPH 155. Thanks for the reference chart. Oct 7, 2020 · If this chart copies, it is for a 27" tall tire Using Transmission Gear Ratio: 1 gives these RPM data: Engine Speed (RPM) MPH 3. 4 days ago · The rear end in the Luv is a 10 bolt unit from Isuzu (not to be confused w/ the 10 bolt from GM) this rear axel was used in all rwd Isuzu's until mid 1987, when isuzu switched over to the stronger 12 bolt unit ( also not to be confused with the 12 bolt made by GM, which is just a junker axle in my opinion) the 12 bolt in these later Isuzus has disc brakes, it is pretty much a direct drop in on Gear ratio changes are possible as long as the ratio selected is within the range of ratios available for the carrier. 10:1, unless 27 inch or larger tires are installed. Also calculated is the new gearing you would need in order to return back to your original gear ratio when going to a bigger or smaller tire. 23 RATIO Dec 29, 2020 · HOW TO DETERMINE YOUR GEAR RATIO. I'm trying to figure out which number determines my gear ratio. 07 16% 3rd 1. The value will be returned in estimated differential gear ratio, based on the entered values… Where there are no RPO/engine information following the rear axle code only means I do not have documentation to verify them. In 1970 the rear end was built in both 10 and 12 bolt versions. 13)", and all divided by "tire diameter in inches and tenths of an inch". Each gear ratio has its own function. What was the most common rear gear put in a square with a th350? What was the most common rear gear put in a square with a 700r4. some people say if its a 4. 91 total first gear ratio. Jul 2, 1998 · G = Detroit Gear & Axle K = GM of Canada M = Pontiac/Canada O = Oldsmobile P = Pontiac W = Warren, MI Axle Ratio Code Table 1962 DA - 3. The car is a 3900# 1976 Chevy Monte Carlo with a 300HP chevy 355CI engine, TH 350 w/ 3000 Stall Converter and 10 Bolt Posi Rearend. Common Chevy Rear End Codes. Since the gear tooth pitch is slightly different than OE, the service life of this gear is limited to less than 25,000 miles. The gear ratio code, date, and rear axle assembly plant are generally stamped into the right (passenger side) axle housing facing forward and exact locations may vary slightly. 5 inches, or 10. How to use the chart. 60 MPH 179. 42, 3. Type 3 carriers are thicker and are designed for use with original gear ratios ranging from 2. The gear ratio can be found in the VDS part of a vehicle’s VIN number. CY 0824B for 3. 70 Gear 8000 RPM 208. 23 ratio GU6 3. You will need to know that there are different series’ of differentials (series two and three). The identification code should be stamped on the bottom or font of right axle tube either adjacent to the carrier housing or about 8" - 10" inboard Dec 24, 2013 · Re: Rear axle gear ratio? 5 or 6 lug is going to be 30 spline from the factory for a 3500lb (HO35) 12-bolt rear end. 73, 3. Y. 42 Dec 30, 2021 · Im trying to find out the best gearing in the rear end for towing and a lil better performance. I cant afford to be without my truck so I am going to get a used rear end to use for a couple weeks while I rebuild the rear end. 76 - 3. This is a retrofit gear to allow the speedometer to function with 3. Swapping out the entire differential is not that much of a hassle, and most of the trucks I have seen, including mine, have been swapped at some point. Divide that number by 60. 56 MPH 167. 56:1 - Tooth Combination 41,16 Ratio 2. This seems to answer my question, but it doesn't factor in the gearing in third gear of my T350 transmission. 73 gears (series two), the differentials will support all gear ratios without having to change carriers. 55. GM/CHEVROLET FINAL DRIVE RATIOS It is the gear under your seat that counts. This is especially helpful when trying to identify a gearset that needs replacement with the same ratio ring and pinion. Charts showing engines offered. Need help? Our gear and axle experts will be happy to assist at (800) 510-0950 Jul 1, 2015 · Figure 1. 5" ring gear. Loaded. e. Input your stock and new tires sizes along with your original gear ratio. 36 was the auto gear, and 4. 43 ratio: Apr 25, 2010 · Here are some gear ratio RPO codes for looking in other vehicles for specific gear sets G72-2. It lists all of the Regular Production Option (RPO) codes for your particular vehicle. 70:1 AA BA Psngr 55-56 Powerglide 3. That 10. 2022 GMC Yukon SLT. There was no particular "right" one for any engine/tranny combo. 97 MPH 6500 RPM 169. 08 Gear MPH 3. Please refer to the Gear Ratio Calculator to determine your rear end axle Apr 29, 2002 · What Rearend Ratio do most of you guys use. The more gears you have, the smaller the difference in ratios will be between them (eg: on a 27 speed bike there would be 9 steps between one gear and another, while on a 3 speed bike there are only 3 steps between each gear). Mar 17, 2023 · Gear Ratio's Effects on Acceleration & Mileage. Where there are no RPO/engine information following the rear axle code only means I do not have build sheets and/or Protect-O-Plates to verify them. (33" dia. 43 10% 4th 1. Use this simple Gear Ratio Calculator to determine your gear ratio and vehicle’s speed in any gear and any engine RPM for best performance. Figure 2. Unless someone swapped out the 14 bolt rear end for a * Engine RPO code and size following the rear axle ratio are taken from build sheets and/or Protect-O-Plates and may not reflect the only engines the rear axle codes came with. 0 and 8. Unless someone has replaced the rear end with something different, that's what should be in there. 67 (4th gear OD ratio) = 2031 rpm @ 60 mph 3. The question of which one is the better option can best be answered by the specific application intended for your vehicle. The calculation uses the number of teeth in the ring gear and divides it by the number of teeth in the pinion gear to provide you with a “[result] to 1” ratio. My setup with a 2. Feb 15, 2019 · “Tall” gears refer to the lower number gear ratios, i. The VDS is the vehicle documentation section on the VIN. This information is essential when replacing a damaged or worn-out rear end assembly or when seeking to upgrade to a performance rear end assembly. Sep 25, 2019 · Simply put, the differential gear ratio is the ratio between the number of revolutions of the input shaft (the driveshaft) and the number of revolutions of the wheel. Rear Axle Assembly Plant - Third character. To get a definitive answer on the ratio of a rear housing, the best way is to pull the rear cover and look at the pinion gear. Rebuilt 3 speed automatic TH350. 73, this means the driveshaft and pinion gear rotates 3. Oct 11, 2021 · In short, the core differences are the 3. 73 ratio GU4-3. 65mph w/1. The 55-mid 57 discs (REGARDLESS of ratio) were all round and had numbers ink stamped (which eventually wore off) for the number of teeth on the ring and pinion gears. I put the car on a dolly to tow home. 32. After much research, CRG is pleased to publish a comprehensive list of 67-69 Camaro axle codes . 625" American Axle ten-bolt Sierra Gear & Axle is a premium line of light-duty differential parts. SOME, repeat, SOME may have had numbers stamped into the discs. Jun 7, 2024 · [ December 12, 2024 ] The Key to Making Your Car Fast: The Torque Converter Technical Info [ December 4, 2024 ] Customizing Ford Crown Victoria Wheels: A Step-by-Step Guide How To & DIY Sep 24, 2010 · I have an 85 scottsdale 1/2 ton w/700r4 and im trying to figure out my rear axle ratio. Cab Silver Ice Metallic 3. 05 times) So 2 turns, x2 = 4. Products include ring and pinion sets, installation kits and axle shafts for GM, Ford, Chrysler, Jeep, and Toyota vehicles. On one of them someone had posted rear axle widths for various models and had posted the codes for gear ratios. Since I've dropped in a whole new drivetrain i didn't want to hook it up to a slug of a rear end without limited slip Sent from my SM-G930P using Tapatalk Aug 1, 2007 · This question doesn't really have anything to do with the gear ratio but is about the rear end. 3L, 8 spd. It came with a 3. 10 rear gear with an Eaton posi. _{Â^¨ÎH/Ãl] fëâ°ÝÇ Yäf ŒÐ4dÿë,p¼~©¨¸š§Ô8 •Â é-hÀáß ¶Øw´Î—AeÙÒÆ ~åž Gearing Calculator Here is a gear calculator you may find very helpful. I was thinking of 4. 07:1 - Tooth Combination 43,14 Ratio 3. My axle code is faded in the glove compartment and cannot read it. May 20, 2005 · Does anyone know what the stock rear end ratio for a 55 chevy sedan, 6 cyl, 3 spd manual, NO overdrive??? Click to expand According to my 1929-1957 Chevrolet Parts manual, the following gear ratios were available in 1955 passenger cars (doesn't include Corvette or trucks): Aug 27, 2015 · 2020-2025. 73 ratio G80-limited slip differential G87-8. You should be able to measure the ring gear inside to be certain. 55 ratio is listed in mine as AB or BB for 55-59. Admittedly, from a dead stop, it does not leave like a rocket. 73 to Re: Axle Ratios 06-19-05 12:51 AM - Post# 719454 In response to SAM_57 Sam, as stated the trucks could be had with several different rear end ratios. G80: Positraction (limited-slip) GU4: 3. If you take a few moments to study the gear chart for your transmission and rear end ratio combination you will see why this product is so popular. 36@109. 10 GU6 = 3. ‘U’ shows it’s an open differential. Nov 23, 2009 · The method I use is to have the tires on the ground and move the car one rotation of the rear wheel(s) and count the rotations of the drive shaft. 55 was the 3 speed gear, 3. Jeep Wrangler TJ Showcase. My list makes more sense to me, but that doesn't mean it's right. 2-inch 10-bolt that saw use under certain Buicks,… May 16, 2018 · ‘G’ indicates the gear ratio is 3. Aug 29, 2013 · 1972 Chevy Nova - 12. 42 rear axle. 5 turns would be a 3. 98 combined gear ratio will make even a smog motor small block Chevy feel good. lum gbd jvh pyx dnjwxkgj jmtwazb elxvj byxbc vqmqd lnworb