As a result, this construction became one of the most popular axle assemblies on the market due to its durability and affordability. . for a ten bolt rear it should be about 20 inch pounds while you are turning the torque wrench. Therefore, when building a performance car or truck that will be subjected to higher than normal stresses and torque loads, such as those produced by high horse power engines or increased traction created by sticky drag racing tires, it may be beneficial to choose a 12-bolt instead of a 10-bolt axle assembly in order to ensure maximum strength and reliability. The lower end of this range will give you a cadence of 90 rpm which translates to an average speed of 30 km/h while the upper end will get you going up to 34 km/h. 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. It is therefore important to strike a balance by carefully adjusting the backlash so that it meets manufacturer requirements for that particular differential system. The torque it takes to crush . There are a few that have geared axles on here so they should chime in and help out with Real TECH :rocking: 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. Im gonna go buy a good manual for shit like this. That way, you dont unknowingly spend money on something you really do not want. Not only is this a wise financial decision for both parties involved, but it also shows how much Chevrolet values customer satisfaction and safety. That being said, it isnot recommended for use behind engines that make a serious amount ofhorsepower. 24-32 INCH pounds?? Sierra Gear & Axle is a premium line of light-duty differential parts. There is no way to happiness.happiness is the way. Instead of using a C-clip to hold the axle in the housing, these axle assemblies use bolt-in axles, much like an 8.2 BOP rearend. TORQUE SPECIFICATIONS. LBS. Rotate the pinion when tightening the nut to seat the bearings evenly. The amount you tighten the nut (with or without the crush sleeve) is based on the amount of force measured in inch pounds it takes to rotate the pinion. The pinion nut is a 32mm or 1 1/4" so you need a socket and adapters for that. The pinion nut needs to be torqued to 250 ft/lbs. MOPAR: 8.75" x 1.75" pinion: .090. . 8-11 in/lbs for broken in bearings is acceptable. The pinion diameter is 1.438 inches, and has 25 splines. 1988 C1500 Silverado, 5.7L with some go fast parts. If the backlash is too tight, you'll need adjust the carrier shim by moving it away from the pinion. BOP stands for Buick/Oldsmobile/Pontiac. Once you get close to the right pinion preload, shim thickness adjustments need to be made in the .003 and down range to make adjustments, small increments make a big difference in pinion preload. Come join the discussion about Silverados, Sierras, and other full size trucks performance, modifications, suspension, lift kits, tires, maintenance, and more! Install left-side adjusting nut lock, washer, and bolt. It is important to follow the instructions that came with your differential cover, as torque specifications can vary drastically depending on the material and grade of fastener used as well as the material of the diff cover itself. Pinion nut torque (shimmed preload style): 250 ft*lb. Ring Gear Backlash Ring Gear Bolts to Cast FT. LBS. Some guys even go to the trouble of making a set-up bearing so you dont have to press on and remove the pinion bearing to try different shims. 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. After it has been properly crushed (by checking the rotating resistance of 19-22 inch pounds on the pinion) there should be at least 150 pounds torque on the pinion nut (or else you pull it apart get another crush sleeve and start over). 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. With the pinion bearing properly lubricated, increase or decrease . Allstar Pinion Nut GM 7.5 8.5 ALL72156. Failure to apply enough preload on the bearings can have an adverse affect on gear contact patterns. If rotating torque is low, tighten pinion nut in 6.8 Nm (5 ft. Before disassembly, we marked the bearing caps and kept the side bearing shims on the correct side. The first is to use a crush collar; this involves applying pressure between the yoke and cup until it reaches the desired depth. Used bearings 10 to 14 inch pounds. The rotating torque must be 2 to 3 N-m (15 - 25 inch pounds). 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. 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. Continue tightening the pinion nut to collapse the spacer and preload the bearings. The oval-shaped cover measures 8 5/16 inches by 10 9/16 inches. DIFF MODEL. If i missed any thing PLEASE tell me. When looking at the housing from the rear, an 8.5 will have two squared off chunks of casting hanging on each side near the bottom of the differential. This tension is achieved through a collapsible spacer which is placed between the bearings and then compressed by turning the pinion gear nut. You will need to know that there are different series of differentials (seriestwo and three). Just think, now when you and Drew drive out to Moab, you can sit and take a nap every other time Drew has to fuel. The retaining bolt can be hard enough to get out without using the red high strength Lock Tight on it. The PYN10 - 10-Bolt 8.5" Pinion Nut is perfect for 30 spline pinions, providing a dependable and secure connection between the driveshaft and differential ring gear. 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. I have a leaky pinion seal and housing seal so I am planning on replacing the seals in the very near future. You have to do it a little differently though. While this article focuses specifically on the GM 8.5 10-bolt rear differential, the parts and processes described herein cover most differential housings.Built from the 1970s through today (the 8.6" 10-bolt is still used in most GM . We pressed the new bearings onto the carrier and the front pinion bearing and went ahead and put the assembly together into the housing. Part Number. You can replace the pinion seal without changing the crush sleeve. The rear end is full of it. Bearing Cap Torque (Foot Lbs.) Torque is a measure of rotational force that must be applied in order to secure components such as axles and other parts together. One intimidating part for a lot of guys is the rear end. Now that we know our pinion depth shim is correct we can do the final assembly. Some pinion nuts require a special procedure to be properly installed. Thanks Mike, Id appreciate it. For a better experience, please enable JavaScript in your browser before proceeding. 3/8" T-bolt - 30 ft lbs. for new bearings. 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. The unique design and shape make installation easier while providing ample strength for off-road applications. This gives us confidence in the quality of the parts we sell. Upgrade your cam, intake, headers, stall converter, and the list goes on from there. The large flanges are easy to grip and make installation or removal easier than ever before, allowing you to easily tighten or loosen the nut without fear of it slipping away. Unfortunately, unless you have the two units side by side, it is nearly impossible to tell them apart. I need the torque on the pinion nut for the rear differential. 12 Bolt Rear Axle Torque Specs. Record pinion flange rotating torque, with a torque wrench. The most current parts and application information can always be found here on our website or by calling one of our differential parts experts. Step 2: Back off, then torque to 35 (lb-ft) for automatic hubs,or 50 (lb-ft) for manual hubs. 7.25 12-14: 6-7: 6-10: 55: 50: 8 IFS: 12-15: 6-8: 6-10: 55: 60: 8.25 12-15: 6-8: 6-10: 55: 60: 8.75 - 41 Case: 13-15: 6-8: 6-10: 55: 90: 8.75 - 42 Case: 15-25: 7 . It was used in different models by all GM divisions with the exception of Cadillac. If it takes more than 25 in lbs to turn the pinion, then you have tightened it too much and you need to back the nut off. The following are recommended Differential Set-Up Specifications for various differentials. There are other 14b axles out there - a 9.5" ring gear semi-float for one, and even a 11.5 . The 8.5-inch 10-bolt rearend is hugely popular because aftermarket carriers and gears are easily interchangeable. When changing a ring & pinion and doing final install of pinion there is no torque spec on the pinion nut itself. In this context, "hardest gear" refers to the ratio of front sprocket teeth to rear sprocket teeth - typically expressed as 4.55:1. Good luck finding one of these, however, as they are very popular among performance enthusiasts. It refers to how much tension is applied to the spring before it's installed in the vehicle and can be adjusted accordingly. Its strength and reliability have been proven time again, making it an excellent option for drivers looking for reliable performance from their vehicle. Reply Quote. There are several differentials for the 10-bolt rearend. Give us a try, we think you'll be glad you did! We show you how to keep that old GM transmission when swapping in an LS engine. SPEC Clutches: For That Next Engine Swap Or OEM, Shop Tour: Brian Tooley Racing Expands To Be A One-Stop, Moroso Anti-Roll Kit Is The Right Tool For The, Steer Your Classic Ride Straight With A New CPP Steering, NEW LS Bellhousing For Magnum And T56-Shifted Hot, Fenix Is A Next-Gen 69 Camaro With 1,180, A Brothers Quarrel Results In This Fine 1955 Chevy, Is This Barn Find The Worlds First Corvette? When it comes to Chevrolet rearends, its the 12-bolt that seems to get all the accolades. Ring gear bolt torque: 110 ft*lb. Axle Retainer Plate Nuts: 3/8" Grade 8 - 45 ft lbs. It is essential to ensure that the pinion flange is firmly held in place with a fixture or tool. Rotating torque should be equal to the reading recorded during removal plus an additional 0.56 Nm (5 inch lbs.). Mine was a pita. An important step I like to take is to assemble the pinion and differential case without the crush sleeve or the new pinion nut. Automotive Chassis Torque Specs. Chevy Hardcore NEWSLETTER - SIGN UP FREE! 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. 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. Most 8.5-inch 10-bolt rearends have two extruded, cast-in lugs on the bottom of the differential housing at the 5:00 and 7:00 positions. Thats usually proven when used in high-performance, high-horsepower applications. FSM says 181-325 ft-lbs. 5 - 8 : Ring Gear Bolt Torque (Foot lbs) 120 : Bearing Cap Torque (Foot lbs) 135 : Pinion Nut Torque: Tighten as necessary to obtain correct preload: Pinion Bearing Retainer Torque (Foot lbs) :65 : . Max Ellery's Land Cruiser Repair Manual 1969-1990 (FJ & RJ) What happens if you have too much backlash in differential. Ring gear bolts 65 foot pounds, bearing cap bolts 60 foot pounds. PINION PRELOAD NEW INCH LBS. 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. It also has an inner diameter of 1 . What is the gear ratio on a 10 bolt rear end? This method works every time is done precisely as described. JavaScript is disabled. Locate a Sierra Gear & Axle Distributor near you. Axle Type Cover Bolts FT. LBS. Find out how to access AutoZone's Torque Specifications Repair Guide for 300, 300C & Magnum 2006-2008, Charger 2006-2008. 2. unbolt pinion nut. Furthermore, its thread size of 1 7/16"-20 makes it compatible with nearly all GM style rear ends from 1955 to present day models. 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. This applies to all types of vehicles with any type of gearing system regardless of pitch or size it doesnt matter which one you change as long as you can adjust it accordingly. ft. range. I have seen the ring gear bolts, pinion nut and retaining bolt come loose, but never a bearing cap bolt. 3/8" x all lengths 45-50 ft lb. Call 800.979.0122, 7am-10pm, everyday. Some vehicles require an 8.5" 10-bolt pinion nut to secure the rear axle assembly of their vehicle. on new bearings, or 1.2 Nm (10 inch lbs.) 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. Replace original worn or damaged nuts each time a gear set is changed. The PYN10 pinion nut has been specifically designed to fit 30 spline pinions and provide a secure fit and lasting performance. **Note the Pinion nut is in INCH pounds Ring Gear Bolts = 55 lb. big gear head. Only 1 nut, it all depends on if your using a new crush collar or not and if your just swapping out the pinion yoke or a full rebuild. 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. Peter - I'm retired but work part time as a pain in the ass. 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. Currie 44 : Torque: Pinion Nut (Solid Spacer) 250 ft lbs. How to eliminate unwanted to holes in your car's body, trunk, floor, or firewall with easy to use patch plugs from Speedway Motors. 3. remove yoke from splines. 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. 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. ALL72156. The 8.5 rearend will have a round cover, and part of the cover will extend rearward to make room for the ring gear. These are incredibly robust pieces of machinery that can handle a surprising amount of power, as long as you use the right axle for your application. without any detrimental effects occurring. When in doubt, refer back to step #6 for more information about suggested torque specs for your particular axle installation project. The carrier bearing rides in the races and you will snap the bolt off before you warp or crack the races. We talked to a few of our in-house race experts about ways to make this racing season your best one yet! PINION NUT GM 7.5 8.5. Call 800.979.0122, 7am-10pm, everyday. Lifted78Chevy. Tighten to 8 ft-lbs (10 N-m), then tighten an additional 1/3 turn to at least 37 ft-lbs (50 N-M). As the speedometer rises, each gear shift is accompanied by an even more intense sensation of power, making every drive exhilarating and unforgettable. This one is not as easy as it sounds. For 30 spline pinion axles, PYN10 offers a 10-bolt 8.5" pinion nut that is designed to provide secure and reliable performance in the toughest of conditions. Constructed from high quality steel, the PYN10 features an integral washer design that ensures proper alignment of the bearing preload during installation and prevents damage to both the yoke and bearings. Alternate Description. 1/2" x all lengths 100-110 ft lb. Once the specified preload has been obtained, make sure the bearings are seated by rotating the pinion several times. How tight should a pinion nut be? A forum community dedicated to GMC and Chevy full size owners and enthusiasts. 9 Minutes Read / Our custom-length driveshaft kits make it a breeze to get the perfect 67-72 C10 driveshaft length. Final torque on the pinion nut is necessary to compress the crush sleeve. By asking ourselves what makes us different than other companies, our answer is that we deliver the level of customer service that other companies only promise. 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 . Sie Bear Caps FT. LBS; AMC 20 . As well as many other third member torque specs from Strange. However, when you have new gears, a new posi unit, and other variables like mixing housings with differentials you might have to try multiple shims to get a good pattern. This ring and pinion install kit comes with new pinion bearings, carrier bearings, races, crush sleeve, pinion nut, pinion seal, a gasket and even has the gear marking grease included. Back off left-side adjusting nut approximately 2 slots. We started by getting a rebuilt kit from Motive Gear . This is all with the old crush sleeve. But, did you know there is more than one style of 10-bolt rearend? ring gear bolts torque at 175lb/ft, bearing cap bolts torque at 200lb/ft, and the ring gear backlash should be between .006-.010 for aftermarket gears, .005-.007 for OEM gears. It is internally different from the 8.2 Chevy, but has the same external bosses and brackets. All 8.6-inchrears have disc brakes, and 8.5-inch units have drum brakes. In addition, if a crush sleeve is over-crushed during installation then it must be discarded and replaced with a new one as it will no longer be able to provide the necessary level of tension between the bearings for them to function properly. Crawlpedia is an off-road encyclopedia featuring a complete list of proper ring and pinion gear set up torque and backlash specs. For that reason,many enthusiasts are considering the 10-bolt. Pinion bearing preload is measured in inch-pounds, and is a measure of the rolling resistance of the pinion bearings after proper torque has been applied to the pinion nut. There is a difference, but you cant see it unless you set both units on their side, and then measure the distance from that surface to the face where the ring gear attaches. This ring and pinion setup guide is Copyright Crawlpedia.com - Please provide a link back to this page when copying. I also like to put some oil on the seal surface of the yoke to avoid tearing the new pinion seal. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Jul 2, 2020 / Over 6,000 Automotive Torque Specs. For the street/strip car, the 10-bolt rearend is a great choice. If you locate a rearend that has coil spring perches, it could be from a G, A, B-body, or El Camino. These are considered highway gears that are good for top speed, not for off-the-line performance. on old bearings. Axle Retainer Plate Nuts: 3/8" T-bolts - 30 ft lbs. I like to measure the old crush sleeve and machine down a solid pinion spacer to that dimension and then . GM 8.6" differentials can be installed in a GM 8.5" axle with the proper conversion bearings. This results in improved performance, longer life span and more efficient operation of the system. The pinion on the left is part of a 4.11:1 gear set; the one on the right is a 3.08:1 pinion. I have seen street 12 bolts that . Mgrotel, nice cliff notes. With its superior strength and durability, you can count on your PYN10 pinion nut to remain securely in place for years of reliable service. The pinion nut should then be secured and tightened until there is no bearing play at all. Next remove the nut and change the seal. Preloading a bearing eliminates the clearance, which increases stiffness and reduces friction. You can feel the power of all that torque in your bones as it propels the car forward even faster than before. First mark the position of the nut with a chisel or other method so you can tighten it back to exactly the same place. This will help ensure that there isn't an excess of tension on these components, which can lead to premature wear or even failure. While a carrier-bearing girdle is available for the 8.2-inch rearend and does give some support to the housing it doesnt provide a reliable and suitably strong solution. Gear oil is nasty stuff, mostly in smell. Randy Bolig has been working on cars and has been involved in the hobby ever since he bought his first car when he was only 14 years old. sny 00235 converted By following these steps carefully and precisely, you can ensure that your gear and carrier are set up correctly for optimal performance. It saved me time and effort trying to crush a brand new crush sleeve. Mikz86TA. A Series 2 carrierwill work with 2.56 and higher gears (numerically lower) such as 2.41. 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. Crankshaft Pulley to Crankshaft bolt 77. CAP TORQUE. Step 3: Back off 3/8-turn for automatic hubs, and just enough to free the bearing for manual hubs. Speedway also offers the Economy Ring & Pinion Setup Tool we needed. carrier bearings, races, crush sleeve, pinion nut, pinion seal, a gasket and even has the gear marking grease included. Copyright 2023 Sierra Gear & Axle - Web Design by Zenxeon Technologies, Backlash for Aftermarket gears .006 -.012, Instructions Differential Installation & Setup, Differential Setup & Torque Specifications, GM RPO Codes Axle & Ratio Identification, Measurement Axle Shaft Length & Bolt Circle. Maintaining your car's paint finish is essential to keep it looking great. Tightening Torque Clamp Load (lbs.) The side bearing preload is the difference of preloads (5) x the gear ratio (3.73) = 18.65. Step 1: To seat, torque nut to 50 (lb-ft) while spinning hub. So, when adjusting preload, if it is too loose then the shims should be removed. These basic steps should pertain to most GM rear differentials and if followed with leave you satisfied for many miles. He is resurrecting a G-Body Chevy Monte Carlo and decided to reuse the original 3.73 gears and a factory GM posi unit. 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. Edit: Alternatively, shims can also be used to adjust the pinion depth. If youre building a street car and want to improve performance, we all know the drill. Backlash refers to the distance between two mating gear teeth when they are not engaged. Is a GM 10 bolt rear end good? Come join the discussion about performance, lift kits, wheels, tires, modifications, troubleshooting, maintenance, and more! The 12-bolt is generally considered to be the stronger of the two rear axles. This is also likely to reduce run times due to lower temperatures as theres less load being put on your vehicles engine when compared to running with a bigger pinion and smaller spur gear combination. 7/16" x all lengths 60-65 ft lb. I like to slowly tighten the new pinion nut until I take up all of the front to back free play. When riding a bicycle, the hardest gear available is sometimes necessary for tackling steep climbs and flats alike. If too tight, the bearings become overstressed and will fail prematurely, causing a catastrophic failure of both the ring and pinion gears. The ideal amount of torque required on a pinion nut when installing an axle depends on many factors, but typically you should aim for 110-125 ft/lbs of torque unless otherwise specified by step #6 during the installation process. Inside the 8.2-inch 10-bolt, the ring-gear bolts have 9/16-inch socket heads with 3/8-24 left-hand threads. FORD: .020. This sleeve must be replaced every time the pinion nut is torqued. Good info on this site from what I've seen so far, kudos. Chrysler 300 and Dodge Charger 2006-2008 Torque Specifications Repair Guide. Inch pound torque wrench that will read that low of a number which will be "VERY" costly. 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 also has an inner diameter of 1 3/16", allowing it to accommodate most 30 spline yokes without any extra modifications or components needed. Original gear ratios in pickups can range from 2.41:1 all the way up to 4.10:1, offering a wide variety of options depending on your needs and preferences. It has been proven to be reliable in high-performance and high-horsepower applications, but it can also handle occasional abuse from use on the racetrack.