Upon initial . 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. 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. Follow along as we show how to measure and install a C10 one piece driveshaft. Failure to apply enough preload on the bearings can have an adverse affect on gear contact patterns. 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 . 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. It has to be drained to get a peak inside. Pinion Nut FT. LBS. Bear Preload IN. Pinion preload (used bearings): 8 - 10 in*lb. You can replace the pinion seal without changing the crush sleeve. RING GEAR TORQUE FOOR LBS. . This should result in approximately 7 thousandths of an inch adjustment in terms of backlash. 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. If in doubt, consult our staff of differential parts specialists. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Allstar Pinion Nut GM 7.5 8.5 ALL72156. 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 . 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. 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. Doing a gear ratio change but not sure what you want? The only torque you should be concerned with is the torque it takes to rotate the pinion gear alone, 8-14 inch pounds for old bearings, 16-29 in/lbs. 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. This is very important, because if you go too far the crush sleeve will be ruined. 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. 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. Products include ring and pinion sets, installation kits and axle shafts for GM, Ford, Chrysler, Jeep, and Toyota vehicles. An important step I like to take is to assemble the pinion and differential case without the crush sleeve or the new pinion nut. The pinion nut is designed to securely fasten the components together while also providing an effective seal against contamination from dirt, dust and other debris. Since listing them all within this article is impossible, well be focusing only on visual identification. 8 to 11 in-lbs. Lifted78Chevy. From there I make very minute changes, checking the pre load with the inch lb torque wrench several times. With the pinion bearing properly lubricated, increase or decrease . You have to do it a little differently though. Install left-side adjusting nut lock, washer, and bolt. What size is pinion nut Silverado? Chrysler 300 and Dodge Charger 2006-2008 Torque Specifications Repair Guide. Mine was a pita. 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. 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. 5. put back together and tight pinion nut to specified torque. When riding a bicycle, the hardest gear available is sometimes necessary for tackling steep climbs and flats alike. These are considered highway gears that are good for top speed, not for off-the-line performance. This is an 8.2 BOP axle. 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. There is no way to happiness.happiness is the way. increments until rotating torque is achieved. Tighten bolt to 20 ft/lbs. With this pinion nut, you can rest assured that your vehicle will be ready for whatever terrain comes its way! Preload doesn't have any effect on spring stiffness; rather, its used as a way of compensating for springs that are too soft or too stiff. Step 2: Back off, then torque to 35 (lb-ft) for automatic hubs,or 50 (lb-ft) for manual hubs. We look forward to serving you! Edit: As the speedometer rises, each gear shift is accompanied by an even more intense sensation of power, making every drive exhilarating and unforgettable. 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. How involved is the process of changing it? A forum community dedicated to GMC and Chevy full size owners and enthusiasts. The Hex is 5/16 the threaded part is SAE 5/16 inch 18 threads per inch. It also uses a 10 5/8-inch irregular-shaped cover. The concept of low-end torque is an important one for drivers to understand when it comes to the performance of a vehicle. Its strength and reliability have been proven time again, making it an excellent option for drivers looking for reliable performance from their vehicle. 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. 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. 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. Locate a Sierra Gear & Axle Distributor near you. By reducing the amount of free play between components, preloaded bearings can provide greater accuracy and quieter operation than standard ball bearings with clearances. Sometimes, you need to push yourself. High-Performance Differentials, Axles & Drivelines, How to Measure and ID Differetial Housings, Filling Trim Holes in Car Body: Sheet Metal Welding Tips, Q&A With Our Race Experts: Tuning and Maintenance Tips, Small Block and Big Block Chevy Engine Flexplate Guide, How to Adapt LS Engine to 700R4 or Turbo 350 Transmissions, Chevy C10 Driveshaft Length Measuring Guide, GM Steering Column Compatibility, Interchange & Repair Guide. Mikz86TA. If sticky tires are used, youll quickly turn the 7.5-inch rear into a pile of unusable parts. Most 8.2 factory covers also have the strangeprotrusionat the top. We think top-notch customer service is the most important thing we do. 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. Mine is leaking. A 2.6-3.0 gear ratio range is perfect for flat places and most people find this ratio suitable for their needs. Whats The Reason Enthusiasts Cant Get, Yes I Am A Dinosaur, And Why I Feel Electric Cars, Rare Rides: The 1969 Chevrolet Camaro COPO, SPEC Clutches: For That Next Engine Swap Or OEM Upgrade, Shop Tour: Brian Tooley Racing Expands To Be A One-Stop Shop, Moroso Anti-Roll Kit Is The Right Tool For The Dragstrip, Why You Need A Proper Fuel Tank Vent In Your Ride, Fenix Is A Next-Gen 69 Camaro With 1,180 Horsepower. If you find a rearend that uses a large spring perch like this, it is from either an X or F-Body. We show you how to keep that old GM transmission when swapping in an LS engine. 1988 C1500 Silverado, 5.7L with some go fast parts. Or some do it by feel. 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. Save Share. Good info on this site from what I've seen so far, kudos. He is resurrecting a G-Body Chevy Monte Carlo and decided to reuse the original 3.73 gears and a factory GM posi unit. Use Loctite #271 on the bolt threads and torque in a crisscross fashion to 55 ft-lb. 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. 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. All 8.6-inchrears have disc brakes, and 8.5-inch units have drum brakes. JavaScript is disabled. The rear end is full of it. We started by getting a rebuilt kit from Motive Gear . . It's essential that you use enough force while tightening down the pinion nut so that your component will stay securely attached; however, it's equally important not to over-torque the part, which could cause permanent damage or deformation. You Make The, SEMA 2022: GEARWRENCH Leveled Up With Distinct Quality Hand, Reignite Your Cat Eye Silverado Headlights With, SEMA 2022: Paragon Corvette Adds Performance Parts To, PRI 2022: FuelTech Talks About The Tech Of The FT700, PRI 2022: Concept Performance Now Offers Aluminum LTR, PRI 2022: Get Locked In With Forgeline Beadlock, Creative Automotion: The Art of Farmtruck &, Randy Bolig The Media Mover And Shaker Behind Chevy, How Ken Lingenfelters Love for Corvettes Benefits So, Shop Tour: Prestige Motorsports Is Your One-Stop Hot Rod, Full Factory Tour: How Edelbrock Makes Its Cast Aluminum, HOLY SHIP! The date and location of manufacture coding changed in 1971. If used in a daily driver or cruiser application, the 7.5-inch rearend should survive behind an engine with 350hp, if traction is limited during spirited driving. 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. MOPAR: 8.75" x 1.75" pinion: .090. . VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. We have your differential parts in stock ready to ship today. I got the price for the seal, and it is near $9. Failure to apply enough preload on the bearings can have an adverse affect on gear contact patterns. Pinion Bearing Preload (New) (inch/lbs) Pinion Bearing Preload (Used) (inch/lbs) Backlash (.001 in) Ring Gear Bolt Torque (Foot lbs.)
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