Depending on what you're using it for, there is an axle size to suit; 7.5/7.625-, 8.2-, 8.5- or 8.6-inches from smallest to largest respectively, so no matter how much horsepower you need to support, there is an option available to fit your needs perfectly and provide excellent strength and reliability even under heavy loads and high speeds. You will need to know that there are different series of differentials (seriestwo and three). GENERAL MOTORS: APPLICATION: FT-LBS / ( N-m) AXLE SHAFT FLANGE BOLT 'S' BODY CAR: 27 (37) TRUCKS: 60 (82) AXLE SPINDLE NUT 'A' BODY: 192 (261) 'C' 'E' 'H' & 'K' BODIES : 180 (245) 'J' & 'L' BODIES . To begin, the yoke or coupler must be attached to the pinion shaft. As an added reference, Speedway Motors also offers a great book from CarTech, titled "High-Performance Differentials, Axles & Drivelines" that helps with step by step breakdowns of the process. The 8-inch rear axle looks very much like the popular Ford 9-inch rear axle. 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Here are the thin shims from the Summit crush sleeve eliminator. Follow along as we show how to measure and install a C10 one piece driveshaft. Pinion nut has no torque spec. This procedure is necessary in order to ensure that everything within the drivetrain is working correctly and efficiently. We'll send you the most interesting Chevy Hardcore articles, news, car features, and videos every week. for new bearings. Although the 7.5-inch 10-bolt closely resembles the 8.5-inch housing, you can positively identify the Chevy7.5-inchrearend by measuring it. The GM 8.5" 10 Bolt axle, also known as the GM 8.6" axle or GM 10-Bolt, is available in many front and rear axle . The easiest way to tell the difference is by looking at the brakes. 12 Bolt Rear Axle Torque Specs. Mine is leaking. PINION NUT GM 7.5 8.5. With the pinion bearing properly lubricated, increase or decrease . **Note the Pinion nut is in INCH pounds Ring Gear Bolts = 55 lb. For reference use at own risk. If it takes a 5/16-inch wrench to remove it, its an 8.5. Sometimes strength is an important factor when choosing between components, and this is true with the 10-bolt and 12-bolt rearends. Furthermore, this action reflects positively on the company's overall commitment to providing reliable transportation services while ensuring its customers' safety remains paramount at all times. Use oil on the pinion nut washer surface during all assemblies . This will ensure that your backlash is correct without having to swap the shims. The pinion nut needs to be torqued to 250 ft/lbs. Ford 9 inch torque specs; Gear Ratio Calculator; Order Forms. 8-10 ft lbs: None: None: GM 12 Bolt Car: Torque: Lubricant: Thread Locker: Main Caps: OEM Housing: . Differential cap bolt torque: 90 ft*lb. In most cases, however, even with a straight case, a certain degree of backlash can be tolerated up to 0.005? Usually, when people are discussing gear ratios, theyre referring to the relationship between a pinion gear and a spur gear. This high quality product ensures that your vehicle's rear axle assembly will remain securely fastened and properly aligned during operation, giving you peace of mind when driving on the roads or tracks. You keep on tightening the pinion nut until you are within the in-lb. Thats usually proven when used in high-performance, high-horsepower applications. GM 8.875" 12 Bolt Differential Ring Gear and Pinion Set. The distance between thebottom center bolt in the cover and its adjacent bolts is 3 1/4 inches. Axle Type Cover Bolts FT. LBS. for a ten bolt rear it should be about 20 inch pounds while you are turning the torque wrench. That does not describe how tight the pinion nut needs to be however. Just out of curiosity,what are the 8.5 (r 65lbft & c 60lbft ?) 2023 Power Automedia. 1989 GMC Suburban SLE 2500 4WD 5.7L Granny 4-speed. Additionally, it increases load capacity because it prevents misalignment due to vibration or thermal expansion of components. It was used in different models by all GM divisions with the exception of Cadillac. Since it was so widely used, there is a better possibility of finding one of them at a salvage yard thanlocating a 12-bolt. Ring Gear Diameter: 8.500Cover Bolts: 10Ring Gear Bolts: 10Ax . 440-500 lbs ft and I wouldn't tackle it bring it somewhere where they know what they are doing..I have a four foot torque wrench that goes to 500 but thats one hell of a grunt and you have to hold the flange while doing this. Ring Gear Backlash Ring Gear Bolts to Cast FT. LBS. Axle Retainer Plate Nuts: 3/8" Grade 8 - 45 ft lbs. GM 8.5" 10 Bolt / Ring & Pinion Gear Set w/ Master Bearing . Max Ellery's Land Cruiser Repair Manual 1969-1990 (FJ & RJ) you have it pretty much. . Would this be the same How to write up for my truck? This means that turning the pedals at the front will turn the back wheel 4.55 times over, which requires quite a bit of effort but allows for fast movement once achieved. Products include ring and pinion sets, installation kits and axle shafts for GM, Ford, Chrysler, Jeep, and Toyota vehicles. Furthermore, this process helps improve performance by increasing load capacity due to preventing misalignment caused by environmental factors such as vibration or thermal expansion of parts over time; additionally it also allows for smoother operation with less noise generation compared to regular ball bearings with their built-in clearances leading ultimately to higher durability rates since theres less overall wear and tear on individual components throughout long term use. GM 8.5 10 bolt - 10 bolt cover with 8.5 ring gear. (Note: The 7.5 GM rear used different pinion bearings in 1979-80 vs. the 81-up axles, so you want to make sure that the old bearings match up to your new pinion bearings). This is done in order to decrease pre-load on the bearings; adding more shims will have an overall effect of decreasing it. It is internally different from the 8.2 Chevy, but has the same external bosses and brackets. For over a decade, the 8.5-inch 10-bolt was widely used as an axle in many cars and trucks produced by General Motors. Sie Bear Caps FT. LBS; AMC 20 The carrier bearing rides in the races and you will snap the bolt off before you warp or crack the races. The engine roars and the tires dig into the pavement as they work to move your car forward, pushing you back into your seat with tremendous force. It should be noted that while this axle is suitable for everyday driving and light duty applications, it must be upgraded if you plan on doing any serious racing or off-road activities with your vehicle. This assembly featured an 8.2-inch ring gear diameter as well as 28-spline axles which provided adequate strength for these vehicles. Thanks Mike, Id appreciate it. Sierra Gear & Axle is a premium line of light-duty differential parts. Once you give everything a thorough inspection you can begin the re-assembly process. Are all GM 10 bolts the same? The side bearing preload is the difference of preloads (5) x the gear ratio (3.73) = 18.65. Backlash = 6-10 (.001 inch) 2003 S-10 ZQ8 - 262/M5:bowtie: 1986 Pontiac Trans Am - 355/A4 Products include ring and pinion sets, installation kits and axle shafts for GM, Ford, Chrysler, Jeep, and Toyota vehicles. The PYN10 is a 30 spline pinion nut designed for this purpose, and it is specifically made to be used with vehicles that have a 30 spline pinion in their 10-bolt 8.5" rear end assembly. The easiest way to identify the 8.2-inch rearend at a glance is by the shape of the housing and the spacing between the lower bolts on the cover. GM 8.6" differentials can be installed in a GM 8.5" axle with the proper conversion bearings. OEM bolts have thread locker on the threads. Oct 20, 2011. Pinion Nut FT. LBS. Find the application and ratio you need? Again, this would be okay in a daily driver or cruiser application, but if installed behind an engine with horsepower numbers climbing into the 400 range, you can plan on an eventual failure. When it comes to adjusting the backlash of your vehicle's pinion gear and carrier, there are a few rules of thumb to keep in mind. By Albert. The most current parts and application information can always be found here on our website or by calling one of our differential parts experts. The 8.2-inch 10-bolt has a smooth, round, lower-case area (no cast-in protrusions), with an 11-inch cover that has a diagonalprotrusion at the top. Connecting Rod Cap Nuts 38. These protrusions are larger than those on the 7.5 rearend. . For inquiries about our products and services, please fill out the form below. This distance must be precise; if it is too small, the gears will bind together and cause mechanical stress which can lead to premature wear or failure. The date and location of manufacture coding changed in 1971. This technology is particularly advantageous in improving vehicle handling and traction under all types of driving conditions, from wet roadways to tight turns. By continuing to use our website, you agree to our Privacy Policy. tighten the nut down till its snug and put on your torque wrench and turn it about 3 revolutions. Edit: Unfortunately, once the tension on this type of sleeve has been released during installation it cannot be re-used since it will no longer hold the proper tension. GM 8.6" gears will fit GM 8.5" axles and as such have become the universal aftermarket size for both. That being said, limited gear sets are offered for the carriers, especially if you plan to change gear ratios. Here is my related question at almost 1 a.m. and torn down in driveway need to get to work: There was quite a chance that you have crushed the sleeve beyond the preload spec to make it hard to turn. Not only is it important to keep the backlash variation under 0.005?, but in an ideal world, no variation should be present at all. One thing often overlooked is the RTV sealant that needs to be applied to the splines (otherwise rear end grease can leak past the splines), and locktite on the new pinion nut. on new bearings, or 1.2 Nm (10 inch lbs.) Crankshaft Pulley to Crankshaft bolt 77. Good info on this site from what I've seen so far, kudos. sny 00235 converted Call 800.979.0122, 7am-10pm, everyday. If you're looking to get the most out of your pickup truck, you may want to consider changing the gear ratios. Chevy Hardcore NEWSLETTER - SIGN UP FREE! It also has an inner diameter of 1 . These basic steps should pertain to most GM rear differentials and if followed with leave you satisfied for many miles.