The GM 8-1/2" 10 bolt rear axle first appeared in vans 1976, however it did not come into widespread use in GM trucks until 1979-1981 when it replaced the 8-7/8" truck axle. From 1982-1987, this 10 bolt axle was used by all the GM 1/2 ton truck models. From 1988 on, the 8-1/2" axle has continued to be used for 1/2 ton class vehicles, plus some 3/4 ton vans. When AAM acquired the GM axle manufacturing assets, the 8-1/2" was renamed the AAM 860 8.6" 10 bolt rear axle.
TK42158 30 Spline Right Inner Axle Shaft for 1979-1991 Dana 44 GM 8.5" K10 and K20 1/2 ton trucks.
Link to TK42158 Catalog Page
TK42159 30 Spline Left Inner Axle Shaft for 1988-1991 Dana 44 GM 8.5" K10 and K20 1/2 ton trucks.
Link to TK42159 Catalog Page
With fuel injected engines, vehicle mileage life expectancy is two to three times as great as it was with carbureted engines so an axle rebearing job is now a preventive maintenance service that should usually be performed on trucks with 150, 000 to 200, 000 miles on the odometer to prevent catastrophic bearing related failures. Our Differential Bearing and Seal Kits include Timken® Differential and Pinion Bearings plus a pinion seal and small parts needed to perform the typical 8-1/2" GM rear axle rebearing service.
There have been a several significant differential component changes to the 8.5"/8.6" family of axles over it's long production life. Up until 1989, the diff side gears and axle shafts all had 28 splines. Starting in 1989, The 28 spline configuration was phased out for many applications by a 30 spline setup using the same small hub type differential case. After 1988, you need to ID your diff parts before ordering. Both 28 and 30 spline axles were made until 2000, plus there are both large hub and small hub types and other changes specific to particular years or models.
QU50850 28 Spline Internal Differential Parts Kit Is a genuine AAM Kit for 1977-1989.5 GM 10 Bolt Rear axles with 28 spline axle shafts. QU50850
QU50967 Application Specific Original Equipment Matched Koyo Outer Pinion Bearing Set for 2009-up AAM/GM 8.6" 10 bolt rear axles. Note: This set has a special bearing angle and the cup/cone must be replaced as a set. This is NOT interchangeable with Timken® standard bearings. More Info
QU50972 Application Specific Original Equipment Matched Koyo Inner Pinion Bearing Set for 2009-up AAM/GM 8.6" 10 bolt rear axles. Note: This set has a special bearing angle and the cup/cone must be replaced as a set. This is NOT interchangeable with Timken® standard bearings. More Info
Q40707 Pinion Yoke 1350 Series Pinion Yoke fits stock applications for GM 10 Bolt 8.5" Rear Axles that use 1-5/16" I.D. Seals. U-Joint cup diameter is 1-3/16", U-Joint width is 3-5/8".
See our QU40707 large text individual page for more details and tech notes.
QU40709 Universal Joint Strap and Bolt Kit for Spicer type 1350 series yoke This genuine Spicer original equipment Kit is used to secure Spicer type universal joints with 1-3/16" diameter cups to Spicer style transfer case and axle end yokes. 5/16" hardened, fine thread Flange Head Bolts have 5/16" hex heads and a threadlocking compound has been applied to the bolt threads. Use one Kit per yoke. Made in U.S.A.
Link to our QU40709 Individual page for more detail & tech notes.
QU30253U Good Used GM 10 Bolt Ring and Pinion Set in a 3.73 ratio for many 8-1/2" 10 Bolt rear axles. More Info
AAM and GM 8-1/2" and 8.6" Rear Axles are of the semi-floating type in which the differential and a single straight roller bearing support each axle shaft. Each axle shaft is held in place by a C-Clip located at the inboard end of the axle shaft.
QU51202 Rear Wheel Seal for many semi-float rear axles including most GM 10 bolt and 12 bolt 1/2 ton rear axles.
Link to QU51202 Catalog Page