Gm 10 bolt identification chart Positive identification of the Corporation (Chevrolet) axle versus the Dana axle is necessary for proper selection and ordering of service Explore the compatibility of various Chevy rear end assemblies with our detailed Chevy Rear End Compatibility Chart. Here are some visual indicators for different Chevy differentials: – 8. General Motors Corporate 10 bolt axle specs and tech. Using the charts below, you will be able to learn alot about the rear differential in your classic full size Chevy. We make it easy to verify your exact rear end by providing specs and year, make, and model applications for Nov 30, 2016 · The Pontiac 10 bolt was a 8. Jul 17, 2024 · The GM 12-bolt rear end is one of the most popular rears for GM vehicles (and many others with a swap), but the 12-bolt is just 3/8-inch larger than the 8. 5s and 7. The 10,41 gear ratio is also great for off-road activities and provides plenty of torque needed to travel at high speeds. Additionally, you can use the gasket size and shape to identify all Chevy truck rear-ends compared with an identification table. This code will tell you the ratio, whether it is posi or not, any special notes and what plant it was made at. May 24, 2011 · I have a 10 bolt bare housing allegedly out of a first gen. 625-inches to give it strength. Use our 1977 1991 GM 10-bolt identification chart online to find the part you need today. Usually only one tire spins, but sometimes both do. 25" IFS Clamshell GM GM Chevrolet GMC Chevrolet GMC Cadillac Silverado Sierra - Sierra Denali Light-Duty Pickup (25 Series / 35 Series) Tahoe - Sonora - Suburban Yukon - Yukon XL Escalade - Escalade ESV Full-Size Utility 100/1500 2014+ 1992-1999 2000-2006 2007-2013 Apr 5, 2006 · Sorry to bring up an old thread but i figured id ask here instead of opening a new thread. 5 10 bolt but my ring gear bolts take a 3/4 wrench on them instead of an 11/16 like i read here and other places. GM / Chevy - Differential IdentificationShop by your differential. You can also check the RPO code list in the glovebox or trunk lid for the original rear, but you still need to verify the actual housing Find the ring gear diameter, pinion diameter, spline, bolts, cover bolts and carrier break of various differential models from GM, Chrysler, Dana and Ford. This guide includes ford rear-end identification, Dana axle identification, and common GM rear-end identification tips. 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. While bleeding the brakes yesterday I discovered several problems ranging from Sep 4, 2024 · For example, there are ten bolts on the GM 10-bolt and 8. All of these axles take different parts so we need to properly identify the axle you have to get you the right part. It is in a 72 concours wagon (9 passenger). net: 1964-1972 Chevelle/El Camino generic rear axle information such as GM part numbers, rear end housing casting numbers & dates and wheel bolt identification. When i purchased it I asked for a 67-69 Camaro axle. May 1, 1999 · Read the tech article on a 10-Bolt Identification Guide, brought to you by the experts at Chevy High Performance Magazine. Dec 1, 2015 · first problem, front axles from any 4x4 can,t be used as rear differentials for several reasons, the direction of rotation the gears used, the axles and universals all make that either difficult or physically or modifying them ,financially, or a mechanical nightmare. General Motors has a wide range of front and rear ends! We carry everything from the 7. Aug 24, 2001 · OLDSmobility. Make the right upgrade. The 8. 5-8. Jun 12, 2014 · Both the 12 and 14 bolt SF axles come in either 6 or 8 lug axle configurations. The silver placard will be labeled “Service Parts Identification” and includes a bunch of three-digit codes. Will it handle the power a 12 bolt can handle? The GM RPO codes label in your glovebox or on drivers door identifies axle ratios and more. The GM 10 bolt is a semi floating front/rear axle used in Chevrolet and GMC pickups from 1977 to present. I want to identify what size 10 bolt I have--7. Chevrolet 1/2 ton, 3/4 ton and 1977 through 1991 Blazer sport utility vehicles utilized the GM 10-bolt differential in front axle four-wheel drive applications. Please select a rear end that matches your vehicle below. Click on your year or scroll down 1958 1959 1960 Customer: Hello I Have a question about the number of splines in my rear axle. It's a gm 10 bolt with number 8 az-c-326-2. 5" and the perches are 42 5/8". 25" IFS front end parts, to the large 11. Visual identification: If the differential has been modified or the identification tags are missing or unreadable, you can visually identify the differential. The best gear ratio for a GM 10 bolt is 10,41 because it is the only ratio that allows your engine to turn 10,41 times per minute. Is this a 7. The 1965-79 numbers are usually found on the front of the passenger side axle tube. Nov 2, 2020 · This article will explain how to properly ID a GM differential carrier by examining your diff's ring and pinion gear set. We’ll help you find the 1977 1991 GM 10-bolt front axle that you need for your 4x4. I need to replace the pinion seal and the size doesn't seem to line up. 10 Bolt 8. 2-inch with open differential. Click the above picture to view full size. This information should help you locate the Auburn Gear differential model appropriate for your vehicle. '83-'84 SS's had 7. 5-inch rear end with Positraction is a hero. 5” rear differential in a 54 Chevy 210. Axle Flange Housing Identification Chevrolet, Ford, Oldsmobile, Pontiac — they all use different axle flanges. The 10 bolt rear is only a 6 lug Count the number of bolts on the cover of your rear axle. The GM 10-bolt is named for the number of bolts on the cover; the ring gear diameter measures 7 1/2 inches. Is there a way to determine if it's an 8. GM built countless thousands of both Apr 24, 2007 · Here's a listing of the performance oriented rear axles as offered from the factory in various G-body vehicles. The flange to flange dimension is 54. The particular engine RPO code is listed in parentheses as found on build sheets. May 16, 2024 · 3. Chevy Muscle Car Tech Tips, Guides, Articles & How-To History and Identification of Chevy 10 and 12 Bolt Chevy Differentials Chevy 10- and 12-bolt axle assemblies have been standard equipment on GM passenger cars, muscle cars, and trucks for decades. The numbers I have off the axle are: Numbers on casting 1235542B Numbers on axle tube JAG1092 Other numbers When it comes to getting power to the pavement, GM's 10-bolt, 8. Compare the dimensions of differentials by model, year and application. all the codes I could find are 1251502 K227 GM49. The codes Apr 13, 2018 · After 1972, General Motors was only installing its 10-bolt rearend in cars, but the 12-bolt remained an option for trucks until 1987. Certain GM 10-bolt rear end differentials utilize limited slip REAR AXLE IDENTIFICATION GUIDE This guide can be used to help identify your rear axle make/model. Variations of this can be found in the rear of certain trucks and some models, as well as in the front of those trucks. . Sep 4, 2018 · [IMG] I’ve got this 10 bolt 8. Jan 30, 2017 · Q: I have a 1964 Chevy II/Nova with a 194 cubic-inch straight-six engine, Powerglide, and a 10-bolt rear-end. 2 B & P 1965-1967 EARLY Jun 17, 2013 · I am trying to ID a 10 bolt rear axle I have fitted to my 55. I can pretty much guarantee that you have the front GM 10 bolt There is no such thing as a 12 bolt FF Crawlpedia is an off-road encyclopedia featuring a complete list of GM RPO axle codes to find your gear ratio. what does this mean? The GM RPO Codes label is usually located inside the glove box or on the Driver’s Side Door Jamb (on the B-Pillar). Sep 5, 2012 · Hey Guys I need some help ID'ing this axle I've got a GM 10 Bolt i'm trying to identify. Mar 25, 2016 · Then in 1971, GM corporate decided they didn’t need two different axle housings so they merged the 10-bolt with the 12-bolt. Other obvious giveaways as to an axles origin is a leaf sprung car will be either a Camaro or Nova while a coil sprung car will be an A-Body or B-Body. Learn axle specs, gear ratios, and best performance parts upgrades. I’m trying to identify the 10-bolt rear axle — I want to know if it is a posi or not. This chart applies to most GM 8. Mar 13, 2018 · The Chevy 10-bolt rearend has really gained in popularity since the 12-bolt has become unobtainium. The prefix for GM RPO codes relevant to Axle Identification is almost always “G”. 10 is 10 bolt,12 is 12 bolt and 14 is 14 bolt. 2) Identification information is provided for differentiating between 10-bolts used in Pontiacs versus Chevrolets. 5 inch or bigger and howmany splines do the axles have? Gr. 5s look remarkably similar, so youʼll need a measuring tape to confirm. 25. ChevelleStuff. 2?) or an 8. Feb 26, 2012 · I have been all over the web and there is alot of conflicting info out there. Variations of this can be found in the rear of GM S-trucks and some Isuzus, and in the front of S-trucks. 2-inch 10-bolt that saw use under certain Buicks,… FORD ID TAGS | GM RPO CODES | DANA SPICER BOM NUMBERS | VISUAL IDENTIFICATION When repairing or upgrading differential parts, the first and most important step is to identify your existing axle / differential. com - The 1967 Oldsmobile Cutlass and 442 Resource - GM 10-bolt Differential Technical Information ------Oldsmobility. Conclusion If your Chevy’s rear-end interchange is failing, it is very important to replace it. I'm trying to identify this thing Do you have a full-float or semi-float 14-bolt axle? Slide-on or stud mounted brake drum? This 14-bolt axle ID guide is for you. The GM 10-bolt differential was featured in both truck and passenger vehicle applications. I have an 8. com-------- Nov 15, 2025 · How To Narrow a Ford 8. 2-inch or the 12-bolt 8. There are no ID tags anywhere. According to Year One Tech, the bolt number count is as follows: 10 bolts on GM 10-bolt, 8. The 1964 serial numbers are found on the bottom of the carrier. The document provides technical information about GM 10-bolt differentials, including: 1) It details the historic changes to 10-bolt differentials over time, including variations in ring and pinion gear diameters, number of splines, and factory gear ratios. 2-inch Chevy 10-bolt: Look for a pair of long flat areas on the front side of each axle tube. 5” 10-bolt. 8 Inch Rearend How To Rebuild a GM 10 Bolt Chevy 8. In the off-road world, you’ll Feb 19, 2016 · Learn how to visually identify rear axles. Find out how to ID that swap-meet find. 5-inch 10-bolt was used in cars and trucks over a wide range of years. Chevrolet used its own 8. Tips from West Coast Differentials. Oct 5, 2022 · The 8. 5" ring gear? Do my flange and perch measurements correspond to a first gen rear end? I would imagine Differential Identification is the first step to getting the right parts for your Gear and Axle project. 5” identification. 5 10-bolt axles Using the charts below, you will be able to learn alot about the rear differential in your classic full size Chevy. GM 10 Bolt Axle Identification I BOP 10 Bolt Axle Identifying a GM 10-bolt rear end housing requires measurements, locating casting numbers, and knowing what to look for. The new corporate 10-bolt started with a medium, 8. Martijn Netherlands GMT 800 8. The gear ratio codes are located on the front passenger side of the differential as shown in the illustration below. The Oct 4, 2024 · GM 10 bolt, 7. 875-inch, the 8. 125" (8. 3) Instructions are Feb 15, 2003 · OLDSmobility. Jump to Latest 2. 2 rear but was considered stronger / better that the BOP 10 bolt and the GM 10 bolt in 8. 5-inch ring gear diameter but retained the 12-bolt’s pinion shaft diameter of 1. I have seen all the pics on web sites and i'm confused, they're not very clear. 5″ Rear End How To Select Proper Rear-End / Differential Gear Ratio Mopar Body Style Codes Popular Automatic Transmission Dimensions Popular Automatic Transmission Identification Chart Rear-End Widths of Classic American Cars The GM 10-bolt is named for the number of bolts on the cover; the ring gear diameter measures 7 1/2 inches. These axles have been used optionally in production with Dana design axles from 1977 thru 1980. REAR AXLE IDENTIFICATION GUIDE This guide can be used to help identify your rear axle make/model. 25 and Dana 60 rear ends, 12 bolts on the GM 12-bolt rear end and nine bolts on the GM 7. 2-inch 10- and 12-bolt axles, while the other divisions used various other axle designs, including one 8. 5. com-------- Looking for a Chevy 10 bolt rear end diagram? Find the diagram and learn about the components and configuration of this popular rear axle assembly. The ability to identify the flange you have can save time and hassle when it comes time to buy parts. 2 or 8. Nov 15, 2025 · Home Axle Flange Housing Identification This site contains affiliate links for which we may be compensated. It’s been used in passenger cars, and light duty pickups and SUVs over the decades. Decipher the codes and get the right parts! AXLE IDENTIFICATION Chevrolet began the manufacture of their own design Front Drive Axles for use on 1/2 and 3/4 ton (K10 & K20) Four Wheel Drive vehicles. 5-inch 10-bolt was used in many different models by every GM division (with the exception of Cadillac) during the 1970s. Click on your year or scroll down 1958 1959 1960 Get 1977 1991 GM 10-bolt front axle identification assistance at Torque King. Rear Axle Identification GM Rear Axle Identified by casting #’s, physical characteristics/appearance, cover bolts (10 or 12) & code stamped in axle tube. Jul 24, 2025 · Decode, ID, and upgrade your GM 12-bolt rear end. First appearing in the 1970 as a corporate replacement for the 10-bolt 8. Jul 2, 1998 · Rear Axle Assembly Codes The rear axle ratio may be determined by finding the two- or three-letter serial number prefix in the following table. 25, and twelve bolts on the GM 12-bolt rear end. Differential Identification by tags or visual clues can be used to accurately identify a differential. 5" rear end parts for 1-ton trucks. Understand the different parts and how they work together in your Chevy vehicle. Check out our Visual Guide! Step 2 Identify the most common GM rear-end types. Like Superman in street clothes, however, it can be hard to identify this beefy unit among its weaker cousins, the 10-bolt, 8. 5's with 3. Jan 21, 2018 · 83 C10 axle identification The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board Identify GM rearend carrier breaks with this guide from Wallace Racing, providing essential information for enthusiasts and mechanics. Jan 30, 2016 · GM CORPORATE 10-BOLT The GM 10-bolt is named for the number of bolts on the cover; ring gear diameter is 7 1/2 inches. com - The 1967 Oldsmobile Cutlass and 442 Resource - 1967 Oldsmobile Differential/Rearend Identification and Ratios 1967 Oldsmobile Differential/Rearend Identification and Ratios 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 from the backing plates. 42's and Nov 6, 2013 · The GM 10-Bolt semi-floating rear axle has been in use for over 40 years. Jan 30, 2015 · A Chevy 3/4 ton pick-up may have a 14 bolt semi-float rear axle or a 14 bolt full-floating axle. 5K views 10 replies 6 participants last post by 55_327 Oct 11, 2024 Mechtech Discussion starter Aug 24, 2001 · OLDSmobility. The 1962-63 serial numbers are located on the front, right side of the differential carrier. When looking at a 12-bolt rearend, it is important to know that 12-bolt axle assemblies use different components for cars and trucks. rlrax igth wghpnyj iukzop ebjh etydhqb ccdsblw zpbyqa dkdonp kmlak rqs uiwqh zuzs fxna cusqct