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Filthy Motorsports: Store > GM 8.5" / 8.6"
GM 8.5" and GM 8.6" (8.625")Axle Parts, Gears, and Upgrades

GM 10-Bolt Axle Models:
GM 8.5" 1998 and Older
GM 8.6" 1999 to 2008
GM 8.6" 2009 +

Axle Specifications:
Ring Gear Diameter: 8.500 / 8.625
Diff Cover Bolts: 10
Ring Gear Bolts: 10
Axle Spline Count: 28 / 30
Axle Shaft Style: Semi-Floating
C-Clips: Yes
Crush Sleeve Yes
Pinion Nut: 1-1/4" / 32mm
Pinion Support: No
Carrier Breaks: 2.56 / 2.73
Dropout Carrier: No

Torque Specifications:
Pinion Preload New: 14 to 19 in-lbs
Pinion Preload Reused: 6 to 8 in-lbs
Ring Gear Backlash:
5-Cut Gears .006" to .010"
2-Cut Gears .003" to .006"
Ring Gear Bolt Torque: 65 ft-lbs
Carrier Bearing Caps: 60 ft-lbs

Popular Applications:
Chevy Blazer 1979 - 2005
Chevy Colorado 2004 - 2012
Chevy Silverado 1500 1999 - 2019
Chevy Suburban 1988 - 2019
Chevy Tahoe 1995 - 2019
GMC Jimmy 1994 - 2005
GMC Sierra 1500 1999 - 2019
Hummer H3 2006 - 2010

Axle Variations:

1998 and Older GM 8.5" 10 Bolt
♦ Small Carrier Bearings
♦ 28 Spline / 30 Spline (1988-1991)

1999 to 2008 GM 8.6" 10 Bolt
♦ Large Carrier Bearings
♦ 30 Spline

2009 and Newer GM 8.6" 10 Bolt
♦ Different Pinion Bearings
♦ 30 Spline


Axle Images:

Axle Details
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 applications including both solid axle and IFS / IRS configurations. While the GM 8.5" axle features an 8.5" diameter ring gear and the GM 8.6" axle uses a slightly larger 8.625" diameter ring gear, almost everything within the axles is completely interchangeable.

Note: GM 8.6" differentials can be installed in a GM 8.5" axle with the proper conversion bearings. GM 8.6" gears will fit GM 8.5" axles and, as such, have become the universal aftermarket size for both.

Note: Some older GM 8.5" front axles have a slightly different differential cover design with one bolt offset. Standard differential covers will still fit these axles when that one bolt is not used (or re-drilled).

*Older "5-Cut" face milled gears have different set up specifications than the newer "2-Cut" face hobbed gears.

Note: This axle has a Carrier Break and gear changes may require a different carrier or thick gears.
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OX Locker images
GM 8.5" OX Locker | 28 Spline (2.73 & Up)
Price: $1,099.00
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OX Lockers have a unique cable shifted locking mechanism that makes them extremely tough, durable, reliable, and easy to use. A heavy duty differential cover is included and the mechanical or air operated shifters (sold separately) make for an easy installation in any vehicle. more info
OX Locker images
GM 8.5" / 8.6" OX Locker | 30 Spline (2.73 & Up)
Price: $1,099.00
Free Shipping

OX Lockers have a unique cable shifted locking mechanism that makes them extremely tough, durable, reliable, and easy to use. A heavy duty differential cover is included and the mechanical or air operated shifters (sold separately) make for an easy installation in any vehicle. more info
Eaton E-Locker
GM 8.5" / 8.6" Eaton E-Locker | 30 Spline (2.73 & Up)
Price: $1,419.99
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Eaton E-Lockers use a proprietary electromagnetic locking mechanism to switch between an open carrier and a fully locked differential. They are specifically designed for use in 4x4 vehicles and feature heavy duty components for maximum durability and reliability. more info
Eaton TrueTrac
GM 8.5" Eaton TrueTrac | 28 Spline C-Clip (2.73 & Up)
Price: $649.99
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Eaton TrueTrac differentials are maintenance free, fully mechanical, Torsen style limited slip differentials with helical gears instead of clutch packs (which wear out over time) to provide constant torque to both wheels while still allowing for smooth turns on pavement. more info
Eaton Detroit TrueTrac
GM 8.5" Eaton TrueTrac | 28 Spline (2.73 & Up)
Price: $699.99
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Detroit Truetrac Lockers are maintenance free, fully mechanical, Torsen style limited slip differentials with helical gears instead of clutch packs (which wear out over time) to provide constant torque to both wheels while still allowing for smooth turns on pavement. more info
Eaton Detroit TrueTrac
GM 8.5" / 8.6" Eaton TrueTrac | 30 Spline C-Clip (2.73 & Up)
Price: $629.99
Free Shipping

Detroit Truetrac Lockers are maintenance free, fully mechanical, Torsen style limited slip differentials with helical gears instead of clutch packs (which wear out over time) to provide constant torque to both wheels while still allowing for smooth turns on pavement. more info
Eaton Detroit TrueTrac
GM 8.5" / 8.6" Eaton TrueTrac | 30 Spline C-Clip (2.73 & Up) | Cryo Treated
Price: $784.95
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Cryogenically Treated TrueTrac Differentials have improved strength, durability, and wear resistance over standard units. They are maintenance free, fully mechanical, Torsen style limited slip differentials with helical gears that provide torque to both wheels at all times. more info
Yukon Master Ring and Pinion Install Kit
GM 8.5" Yukon Master Overhaul Kit | HD Rear (for Eaton Lockers)
Price: $324.18
Your Price: $281.90

Yukon master overhaul kits include everything you need to rebuild your differential, install new ring and pinion gears or add a differential locker. Every component is of the highest quality and engineered specifically for your application to ensure accurate set up. more info
Yukon Master Ring and Pinion Install Kit
GM 8.5" Yukon Master Overhaul Kit | HD Front (for Eaton Lockers)
Price: $324.18
Your Price: $281.90

Yukon master overhaul kits include everything you need to rebuild your differential, install new ring and pinion gears or add a differential locker. Every component is of the highest quality and engineered specifically for your application to ensure accurate set up. more info
   
 
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