While backlash is a necessary component of manufacturing tolerances, it can be a significant source of problems for certain applications. The 8.5-inch pinion diameter is 1.625 inches, whereas the 8.2-inch is smaller at 1.435 inches. 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. Now that we know our pinion depth shim is correct we can do the final assembly. This is especially true when it comes to cycling. 5. put back together and tight pinion nut to specified torque. Follow along as Zach works over the old 10 bolt and brings it back to life. 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 . . You can feel the power of all that torque in your bones as it propels the car forward even faster than before. GM 8.6" gears will fit GM 8.5" axles and as such have become the universal aftermarket size for both. Dana Technical Service Specs. We'll send you the most interesting Chevy Hardcore articles, news, car features, and videos every week. If it takes a 5/16-inch wrench to remove it, its an 8.5. This will cause the bearings to press more firmly against the races, thereby increasing preload tension. Camshaft thrust Plate bolts 106 in-lbs. 3.08 and numerically lower gears = 1.660-inch, 3.23 and numerically higher gears = 1.950- inch, 2.73 and numerically lower gears = 1.615-inch, 3.08 and numerically higher gears = 2.00-inch, 2.56 and numerically lower gears = 1.530-inch, 2.73 and numerically higher gears = 1.720-inch. if it is under twents hold the yoke with a pipe wrench and tighten just a little at at time till the torque wrench reads a constant 20 inch pounds for the revolutions. Torque measures the amount of force that is generated when the engine rotates at a certain speed. Good luck finding one of these, however, as they are very popular among performance enthusiasts. When riding a bicycle, the hardest gear available is sometimes necessary for tackling steep climbs and flats alike. . 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. It was first developed for racing cars where superior control on fast corners is essential for success; however, today torque vectoring differentials can be found in many production vehicles as well due to their exceptional performance benefits. There were an untold number of 8.2-inch axle assemblies built, and although it is only marginally stronger than the 7.5-inch rearend, it does have some aftermarket support. 1. Use the blue medium strength on the retaining bolt and the red on the others. 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). ALL72156. 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. 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. I also like to put some oil on the seal surface of the yoke to avoid tearing the new pinion seal. The concept of low-end torque is an important one for drivers to understand when it comes to the performance of a vehicle. Pin. With the exception of truck differentials with 30-spline axles, andthosecarrying 2.41 and 2.73 gears (series two), the differentials will support all gear ratios without having to change carriers. 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. does anyone know the torque specs for a 10 bolt 7.5 for the pinion and carrier caps . 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. Connecting Rod Cap Nuts 38. 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. This heavy duty nut has been designed using high grade steel and features a zinc plated finish for maximum protection against rust and corrosion. Cover Bolts: 25 ft lbs. The rotating torque must be 2 to 3 N-m (15 - 25 inch pounds). 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. As the speedometer rises, each gear shift is accompanied by an even more intense sensation of power, making every drive exhilarating and unforgettable. Gear Ratio Calculator - Calculate the gear ratio of gears based on their tooth count. 1. remove d shaft straps push shaft aside. 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. This allows you to put the pinion gear in, set the pinion bearing pre-load, set the backlash and then run a contact pattern without the chance of compressing the crush sleeve too much. Sometimes, you need to push yourself. Both axles use a third member that contains the differential, which is made up of the . Would this be the same How to write up for my truck? Gear Ratio Finder - Find the ideal axle gear ratio for your new larger or smaller tires. 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. 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. Ultimately, both engine power and torque play important roles in determining a cars performance capability as well as its overall efficiency. Ford 9 inch torque specs; Gear Ratio Calculator; Order Forms. I was able to pull the old crush sleeve from the pinion gear shaft without damaging it, so I just reused it and added a 0.51mm shim to it. The most current parts and application information can always be found here on our website or by calling one of our differential parts experts. when assembling the pinion into place, include the crush sleeve between the two pinion bearings. That does not describe how tight the pinion nut needs to be however. We pressed the new bearings onto the carrier and the front pinion bearing and went ahead and put the assembly together into the housing. Record pinion flange rotating torque, with a torque wrench. 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. to do this. Try our Differential Gear Calculator. Then use lock-tight on the threads and tighten the nut back to where it was. In this context, "hardest gear" refers to the ratio of front sprocket teeth to rear sprocket teeth - typically expressed as 4.55:1. While deciding on the ideal gear ratio for your bike, it's important to consider that a lower value will provide more comfortable pedaling, as you'll be able to spin the pedals at a higher cadence. I will attempt to cover the necessary steps in building a differential for a GM 10 bolt rear end with an 8.5/8.6 ring gear. Take Zach R. for instance. Save Share. ALL72156. . This strength comes from its larger pinion shaft diameter which measures 1.625 inches with 30 splines, 13 percent larger than the 1.438 inch diameter and 25 spline pinion shaft found on a 10-bolt axle. That way, you dont unknowingly spend money on something you really do not want. This method works every time is done precisely as described. You can rest assured knowing that your axle is secured with this high quality product. increments until rotating torque is achieved. Fords small block and big block engine families have their share of flexplate differences. The side bearing preload is the difference of preloads (5) x the gear ratio (3.73) = 18.65. 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. Unfortunately, you cannot rely on this torque because the crush sleeve provides unpredictable and non-linear resistance as it buckles and crushes. This will help ensure that there isn't an excess of tension on these components, which can lead to premature wear or even failure. 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. This ring and pinion setup guide is Copyright Crawlpedia.com - Please provide a link back to this page when copying. First introduced in 1970 as a corporate replacement for the older 8.2-inch 10-bolt or 12-bolt 8.875-inch axles, its popularity quickly spread to nearly every GM division aside from Cadillac throughout the 70s. 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. Continue tightening the pinion nut to collapse the spacer and preload the bearings. 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. Ring and Pinion Ratio Variations - An explanation of why some ring and pinion gear ratios vary. It is therefore important to strike a balance by carefully adjusting the backlash so that it meets manufacturer requirements for that particular differential system. range. FOR 1994-2001 CHEVY S10's & GMC SONOMA's. **ALL TORQUE SPECS ARE PER GM FACTORY & HAYNES MANUAL**. 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. Reply Quote. Once the specified preload has been obtained, make sure the bearings are seated by rotating the pinion several times. The Fora platform includes forum software by XenForo. 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. Additionally, it increases load capacity because it prevents misalignment due to vibration or thermal expansion of components. lbs.
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pinion nut torque specs gm 10 bolt