Known alternatively as the GM 8.875-inch (referring to its ring gear diameter), Chevrolet's 12-bolt rear end is one of the most celebrated in the American hot-rodding scene. The 8.5-inch 10-bolt also shares the same pinion shaft diameter as the more expensive 12-bolt. Recheck the torque to turn the pinion until it gets to the point where the amount of torque it takes to turn the pinion is between 15-25 in. This will help ensure that there isn't an excess of tension on these components, which can lead to premature wear or even failure. Back off left-side adjusting nut approximately 2 slots. Whilethe 10-bolt rearendslineage can be identified by the code stamps, which are usually on the passengers side axle tube, there are literally hundreds ofpotential codes for the three different 10-bolt rearend housings. If you're looking to get the most out of your pickup truck, you may want to consider changing the gear ratios. For that reason,many enthusiasts are considering the 10-bolt. 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. Sierra Gear & Axle parts are designed and engineered to the highest quality specifications for use in street, off-road and performance environments. lbs.) When a very slight increase in pinion turning effort is noted, check the pinion rotating torque using an inch-pound torque wrench. Good luck finding one of these, however, as they are very popular among performance enthusiasts. Speedway also offers the . Assemblers must decide for themselves how much leeway they are willing to allow in this area and assess whether the potential results would warrant such leniency. 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. Axle Type Cover Bolts FT. LBS. The tension between the bearings of a crush sleeve is a very important factor in its performance, as it helps to ensure that the bearing stays correctly set and does not move or become misaligned. Quaility Gears provide guaranteed performance. Usually, when people are discussing gear ratios, theyre referring to the relationship between a pinion gear and a spur gear. Axle Retainer Plate Nuts: 3/8" T-bolts - 30 ft lbs. 12 Bolt Rear Axle Torque Specs. Maintaining your car's paint finish is essential to keep it looking great. It involves placing a collapsible spacer between the bearings of the pinion gear, then using a torque wrench to tighten the pinion nut until it reaches the correct amount of pressure or preload on the bearings. You will also notice the large, flat, cast-in protrusions at thefive andseven oclock positions. This heavy duty nut has been designed using high grade steel and features a zinc plated finish for maximum protection against rust and corrosion. It is important to have the right pinion nut for your 8.5-inch 10-bolt rearend. We were lucky and had a desirable contact pattern on both the drive and coast sides of the gear teeth. GM 8.6" differentials can be installed in a GM 8.5" axle with the proper conversion bearings. Some pinion nuts require a special procedure to be properly installed. These basic steps should pertain to most GM rear differentials and if followed with leave you satisfied for many miles. When combined with a low curb weight, this combination creates acceleration so fast it feels almost supernatural. Differential cap bolt torque: 90 ft*lb. CAP TORQUE. 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. without any detrimental effects occurring. I have a 1993 Suburban K1500. This should result in approximately 7 thousandths of an inch adjustment in terms of backlash. 1989 GMC Suburban SLE 2500 4WD 5.7L Granny 4-speed. This axle was found in various vehicles from Chevrolets and Pontiacs to Oldsmobiles and Buicks with some of these models continuing production well into the early 80's. Looking for a driveshaft for your 67-72 C10? Or some do it by feel. This article is a compilation of information and and specs relating to the venerable GM Corporate 14 Bolt full-floating rear axle - also referred to as the 10.5" (after the size of the ring gear in inches) or just simply the "14b" for short. 7/16" x all lengths 60-65 ft lb. Thats usually proven when used in high-performance, high-horsepower applications. Rotating torque should be equal to the reading recorded during removal plus an additional 0.56 Nm (5 inch lbs.). Inch pound torque wrench that will read that low of a number which will be "VERY" costly. Tighten to 8 ft-lbs (10 N-m), then tighten an additional 1/3 turn to at least 37 ft-lbs (50 N-M). After that we removed the old bearings and cleaned all the parts up in the solvent tank. Oct 29, 2001. If you installed a new seal, add 1 or 2 in-oz. This method works every time is done precisely as described. Too much won't hurt anything other than break the bolt. CRAWLPEDIA Off-Road Encyclopedia. Camshaft thrust Plate bolts 106 in-lbs. The covers on the 8.5-inch rearends are often 11 inches round with a bulge on the drivers side to accommodate the ring gear. Ring gear bolts. This is zero backlash. Well help you determine the correct flexplate for your Chevy engine in this buyers guide. DANA SPICER: .035. If you locate a rearend that has coil spring perches, it could be from a G, A, B-body, or El Camino. Replace original worn or damaged nuts each time a gear set is changed. Not only will you be getting the best quality performance with JEGS Pinion Nut, but you'll also have the convenience of knowing it's made to fit GM 8.875 inch 12-bolt car and truck axles. Torque is a measure of rotational force that must be applied in order to secure components such as axles and other parts together. I agree that the preload needs to be about 30 inch pounds. Over several generations of small block Chevy (and big block Chevy) engines there have been several changes that dictate what flexplate works with them. On the other hand, reducing the size of the pinion or increasing the size of spur gear will result in decreased top speed but with an increase in acceleration. 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. If it checks out you can put your axles back in, C clips on, cross pin and bolt and you are ready to put the cover on and fill it with rear end lube! We look forward to serving you! By Albert. Next remove the nut and change the seal. The reason why it's so hard to turn the pinion nut is because not only are you crushing the crush collar but you're also pressing the outer pinion bearing onto the pinion gear. When working on the assembly of a differential, there are two methods for adjusting the pinion depth. Zach got enlisted by a friend to help rebuild the 7.5" factory 10 Bolt rear in the G-Body Monte that he is working on, so naturally it became a teaching moment. Good info on this site from what I've seen so far, kudos. Im gonna go buy a good manual for shit like this. The date and location of manufacture coding changed in 1971. The 8.5-inch 10-bolt rearend is hugely popular because aftermarket carriers and gears are easily interchangeable. Lighter and more efficient than its Ford 9-inch and Dana 60 rivals, the 12-bolt enjoys as much use amongst brand-loyal off-roaders as it . It's got a 350 with a 10-bolt rear end. to do this. Differential Locker Comparison - A detailed comparison of popular differentials and lockers. If i missed any thing PLEASE tell me. Axle Order Form; Floater Axle Order Form; Custom Driveshaft Order Form; . Just out of curiosity,what are the 8.5 (r 65lbft & c 60lbft ?) Dana 60. Our stock 10-bolt was plenty stout to withstand the torture of 165 hp from the ZedSled's stock 350 (yes, that was sarcasm), but we're looking down the barrel at 500 hp from our cammed-up 6.0 swap . The 8.5-inch is often referred to as the "GM corporate 10-bolt" because of its multiple uses, and the 8.5-inch is a semi-float axle, meaning it has only one axle bearing per side, mounted inside the axle tube. The rotating torque must be 2 to 3 N-m (15 - 25 inch pounds). Speedway Motors employees enjoy not only helping our customers, but also turning some wrenches in their downtime as well. This is in contrast to high-end torque, which describes how much power and force is produced by an engine at higher RPMs, such as 4000 or 6000. and 12 bolt #s. found these #s at Richmond Gear: Torque specifications. Low-end torque refers to the amount of power and force generated by an engine at low revolutions per minute (RPMs), usually between 2000 and 3000. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. The specified preload needs to be obtained by carefully crushing the spacer with just enough force from turning the pinion nut in order for it not to be too loose or too tight, as either one can cause serious damage if done incorrectly. Sometimes, pinion bearing preload can be a tricky procedure. The 8.5 rearend will have a round cover, and part of the cover will extend rearward to make room for the ring gear. By continuing to use our website, you agree to our Privacy Policy. May 22, 2021 / Ring Gear Diameter: 8.500Cover Bolts: 10Ring Gear Bolts: 10Ax . Tightening Torque Clamp Load (lbs.) With its strong construction and corrosion resistant coating, the PYN10 provides reliable performance for years to come, making it one of the best choices you can make when securing your vehicle's rear axle assembly. MOPAR: 8.75" x 1.75" pinion: .090. . In most cases, however, even with a straight case, a certain degree of backlash can be tolerated up to 0.005? The reliability of the axle tube and . (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). Sure, you know whats in there and what it does but are you willing to tear into it and rebuild the differential? How tight should a pinion nut be? Talk to the experts. It is not an uncommon sight to see a Yukon Gear Pinion Nut when it comes to automotive repairs. Inside the 8.2-inch 10-bolt, the ring-gear bolts have 9/16-inch socket heads with 3/8-24 left-hand threads. Pinion nut has no torque spec. Follow along as Zach works over the old 10 bolt and brings it back to life. Bearing Cap Torque (Foot Lbs.) See all 36 photos. . There are several differentials for the 10-bolt rearend. The pinion diameter is 1.438 inches, and has 25 splines. 8 to 11 in-lbs. Since it was so widely used, there is a better possibility of finding one of them at a salvage yard thanlocating a 12-bolt. With the pinion bearing properly lubricated, increase or decrease . 10.50 PINION NUT: GM . This will cause the bearings to press more firmly against the races, thereby increasing preload tension. Preload plays an important role in many machine designs for its ability to reduce wear and tear on critical components while improving efficiency and accuracy. By reducing the amount of free play between components, preloaded bearings can provide greater accuracy and quieter operation than standard ball bearings with clearances. If sticky tires are used, youll quickly turn the 7.5-inch rear into a pile of unusable parts. What happens if you have too much backlash in differential. The LS swap is no doubt still going strong, but if youre planning to run an automatic behind your 4.8, 5.3, or 6.0L LS-powered ride, youll need to pay attention to a few items we discuss in this buyers guide. Therefore when dealing with these types of sleeves it's important to make sure they are installed correctly so as not to compromise its integrity or longevity. Bear Preload IN. Then use lock-tight on the threads and tighten the nut back to where it was. With the carrier removed w/ new bearings pinion bearing preload should measure a rolling torque of 20-30 in/lbs. While the 8.5-inch rearend was used on vehicles up to 1999, The 8.6-inch (8.625) was used on 2000 and later-year trucks. 1/2" T-bolts - 50 ft lbs. This results in improved performance, longer life span and more efficient operation of the system. Uses 28 or 30 spline c-clip axles. Max Ellery's Land Cruiser Repair Manual 1969-1990 (FJ & RJ) GM: .035. Ring Gear Bolt Torque (Foot lbs) (N.m.) Bearing Cap Torque (Foot lbs) (N.m.) AMC; Model 15 : 20 - 40 (2.3 - 4.5 ) . On the other hand, if there is too much backlash then this will also lead to excessive mechanical wear due to increased friction and noise as the teeth continually rub against each other. Upon initial . Just get a couple sacrificial pinion bearings and open them up a little so you don't have to press them on and off the pinion and add/remove shims until you get the correct preload shown on page 2 of the set up manual. ExtCab96S_Dime . The side bearing preload is the difference of preloads (5) x the gear ratio (3.73) = 18.65. With proper maintenance, this rearend will hold up over time and ensure that your vehicle runs smoothly no matter what sort of conditions you put it in. 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. 2008 Sprinter 2500 170 - camper van. A forum community dedicated to GMC and Chevy full size owners and enthusiasts. Some of the most popular GM vehicles have come with 10-bolt rear ends. Chevy Hardcore NEWSLETTER - SIGN UP FREE! That being said, it isnot recommended for use behind engines that make a serious amount ofhorsepower. Come join the discussion about Silverados, Sierras, and other full size trucks performance, modifications, suspension, lift kits, tires, maintenance, and more! The following table contains the proper specifications for all popular axles. If youre building a street car and want to improve performance, we all know the drill. 8-10 ft lbs: None: None: GM 12 Bolt Car: Torque: Lubricant: Thread Locker: Main Caps: OEM Housing: . All rights reserved. :yipi: Thats it?? The Fora platform includes forum software by XenForo. The pinion nut should then be secured and tightened until there is no bearing play at all. This is an 8.2 BOP axle. This ring and pinion setup guide is Copyright Crawlpedia.com - Please provide a link back to this page when copying. The most current parts and application information can always be found here on our website or by calling one of our differential parts experts. It's not easy, but pushing yourself can be rewarding; after all, with hard work come great rewards! By following these steps carefully and precisely, you can ensure that your gear and carrier are set up correctly for optimal performance. 8 & 9 BOLTS Locknut Size Threads per inch Steel Hex Locknut Steel Hex Flange Nut Grade C FNL Grade 9 Grade F Grade G Clamp Load (lbs.) Backlash refers to the distance between two mating gear teeth when they are not engaged. Step 2: Back off, then torque to 35 (lb-ft) for automatic hubs,or 50 (lb-ft) for manual hubs. 1/2" x all lengths 100-110 ft lb. . If it takes a 1/2-inch wrench to remove it, its an 8.2. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Choosing a higher ratio will provide more power and torque for pulling heavier loads or navigating steep grades with ease, while lower gears are better suited for those tackling long stretches of open highway or cruising around town at slower speeds. Mikz86TA. One will want to torque the pinion nut to 190- 240 ft lbs (Small Diff's) D60 and larger 225 -350 Ft lbs with the proper preload achieved. With careful consideration, selecting an appropriate option for your driving style can make a world of difference when it comes to performance and efficiency behind the wheel. These are two pinion gears for the 8.5-inch 10-bolt. range. As the speedometer rises, each gear shift is accompanied by an even more intense sensation of power, making every drive exhilarating and unforgettable. Increasing the size of the pinion or decreasing the size of spur gear will result in increased top speed for your vehicle; however this will come at cost to acceleration and increase temperatures from increased load. Axle Images: Axle Details. There is an anomaly to the corporate 8.5-inch axle assembly that was used in some 1971 and 1972 Buick, Oldsmobile, a few 1969 through 1972 Pontiac vehicles, as well as the 1970 through 1972 Monte Carlo. I need the torque on the pinion nut for the rear differential. West Coast Differentials stocks a complete line of light duty axle parts for Chevrolet, Chrysler, Dana, Ford, GM, Jeep and Toyota and more! By doing this, it allows for the desired amount of pressure or preload to be applied on these bearings so they are able to work in harmony with each other within their particular drivetrain system. Rancho Cordova, CA 95742, Bearing Preload, Backlash and Torque Specifications. What is the gear ratio on a 10 bolt rear end? Would this be the same How to write up for my truck? Our LS swap adapter kits make it easy! When additional shims are added, this increases the total width of the retainer assembly, pushing the bearing cones further away from their respective cups and as a result reducing drag on them. Gear Ratio Calculator - Calculate the gear ratio of gears based on their tooth count. Allstar Pinion Nut GM 7.5 8.5 ALL72156. Received 16 Likes on 13 Posts. sny 00235 converted Read More. The pinion bearing preload is an important component of the drivetrain system, as it works to ensure that the pinion gear's tapered bearings are running smoothly and efficiently. This versatility makes it a great choice for those who want to take their car from the street to the track without worrying about its durability. It is well known that altering the gear ratio of a vehicle, whether it be through changing the pinion or spur gear, can have a significant effect on performance. Use oil on the pinion nut washer surface during all assemblies . Not only was the 10-bolt assembly used in low performance applications, but it was also utilized in a variety of different vehicles ranging from Camaros, Chevelles and Impalas to even the earlier Chevy IIs. DIFF MODEL. Pinion Nut Torque Spec. Try our Differential Gear Calculator. A higher engine power combined with more torque enables cars to accelerate faster while using less fuel - making it much more efficient and cost-effective in the long run. The pinion diameter is 1.438 inches, and has 25 splines. By Albert. When in doubt, refer back to step #6 for more information about suggested torque specs for your particular axle installation project. I also like to put some oil on the seal surface of the yoke to avoid tearing the new pinion seal. While adjusting preload can provide some relief from overly-stiff or soft springs, ultimately you should replace the springs themselves if they dont provide the desired level of performance. The pinion nut should also measure 1 1/8 inches, if the OEM pinion nut is still in use. As well as many other third member torque specs from Strange. Sometimes when repairing or replacing components within a transmission, you may encounter a crush sleeve. It is important to keep in mind that this can change dramatically based on specific materials used or other variables so it is critical to be sure to consult any instruction manual included with your differential cover before attempting any installation. .006" to .010" 120 ft-lbs. The inch pound rating is the force required to turn the pinion after the crush sleeve has been crushed. The rear end is full of it. Inside the 8.2-inch 10-bolt, the ring-gear bolts have 9/16-inch socket heads with 3/8-24 left-hand threads. Pinion nut torque (shimmed preload style): 250 ft*lb. Our custom-length driveshaft kits make it a breeze to get the perfect 67-72 C10 driveshaft length. If the backlash is too tight, you'll need adjust the carrier shim by moving it away from the pinion. So, in order to adjust the pinion bearing pre-load, shims of varying thicknesses are inserted into pre-load retainers. This process must be done carefully, gradually increasing the tightness of the nut in increments until it reaches the desired torque level required to rotate the pinion correctly. Sometimes, you need to push yourself. This tension is achieved through a collapsible spacer which is placed between the bearings and then compressed by turning the pinion gear nut. The distinction between these two types of torque can be useful for assessing how well a car will perform in different situations: cars with higher levels of low-end torque are typically better suited for starting from standstill or accelerating quickly; whereas cars with greater amounts of high-end torque are likely more suitable for reaching faster top speeds over long distances. **Note the Pinion nut is in INCH pounds Ring Gear Bolts = 55 lb. TORQUE-TENSION REFERENCE GUIDE Printed in U.S.A. Supply Part Number: 9702365 AS 06/14 Torque Poster . The PYN10 pinion nut has been specifically designed to fit 30 spline pinions and provide a secure fit and lasting performance. 2023 Power Automedia. Not sure what to do here but I know I'm looking at a boat load of parts I do not have the money for right now so not sure what the hell I'm going to do. Doing a gear ratio change but not sure what you want? This heavy-duty nut is made with high quality materials and manufactured to exacting standards, ensuring it stands up to whatever you throw at it. How involved is the process of changing it? Since listing them all within this article is impossible, well be focusing only on visual identification. Once you have obtained your desired setting, it is important to apply preload while rotating the pinion in order to ensure proper engagement with its mating components. This procedure is necessary in order to ensure that everything within the drivetrain is working correctly and efficiently. Is that really all it takes? Thick Gears and Carrier Breaks - Thick ring and pinion gears and differential carrier breaks explained. Many mechanics use an impact gun while others insist the nut should be torqued by hand. 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 purpose of preloading a bearing is to eliminate any existing clearance that has been designed into standard ball bearings by utilizing tension or compression loads applied directly onto each component within the assembly. Crankshaft Pulley to Hub Bolts 37. If your just swapping the pinion yoke out or putting in a new pinion seal and your re-using the old crush collar, just tighten the nut back down till ALL the slop is gone and then tighten about a 1/4 turn more to make sure there is tension on the old crush collar. The X and F-body spring perches come in two versions: mono-leaf (left) which is shallower than the multi-leaf (right). It is important to note that if possible, it is best practice to use an old or used pinion nut for this operation, as new ones can often bind when tightened too much. ALL72156. Reports from multiple Chevy Bolt owners confirm that on May 28th, 2021, Chevrolet began taking steps to rectify any potential issues with these cars by paying off the original cost and allowing them to be taken off of the road. The 10-bolt GM rear end has been used in many different applications since its introduction in 1968 and continues to be highly regarded as one of the toughest axles available today due to its proven durability and versatility over decades of use in a variety of situations requiring extreme performance requirements from street racing too off roading adventures. minimum is 181 ft-lbs., maximum 325 ft-lbs., keep cranking till you get within the range of 7.8-11.3 in-lbs of preload torque on the pinion. 24-32 INCH pounds?? 2429 Mercantile Drive Suite A, Rancho Cordova, CA 95742, Copyright 2023 West Coast Differentials | Website Design by. Reply Quote. Next, attach the pinion nut onto the end of the shaft and use a torque wrench to tighten it to between 110-125 ft/lbs of torque. FOR 1994-2001 CHEVY S10's & GMC SONOMA's. **ALL TORQUE SPECS ARE PER GM FACTORY & HAYNES MANUAL**. Over 6,000 Automotive Torque Specs. To ensure optimal performance in any application, it is essential to pay close attention to the amount of backlash between gears on all differentials.