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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 / 12
Ring Gear Bolts: 10
Axle Spline Count: 30 / 28 / 32
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

References and Resources:
Detailed Front Axle Rebuild
Detailed Rear Axle Rebuild

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

Popular Applications:
Chevy Blazer / S10 1977 - 1998 F / R
Chevy Suburban 1977 - 2008 F / R
Chevy Silverado 1999 + Rear
Chevy Tahoe 1999 + Rear
Chevy Avalanche 2002 + Rear
Chevy C10 / C25 1979 +
Rear
Chevy Camaro 2010 + Rear
Cadillac Escalade 1999 + Rear
GMC K5 / K25 1977 - 1999 F / R
GMC Yukon 1999 + Rear
Hummer H3 2005 - 2010 Rear
GMC Sierra 1999 + Rear
GMC Envoy 2002 - 2009 Rear

Axle Variations:
GM 8.5" 10 Bolt 1998 and Older with Drum Brakes
Small Carrier Bearings
Front and Rear Applications
28 / 30 / 31 Spline Axle Shafts.
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).
GM 8.6" 10 Bolt 1999 and Newer with Disc Brakes
Large Carrier Bearings
Rear Solid and IRS Applications
30 / 32 (IRS) Spline Axle Shafts
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.

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.

*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
GM 8.5" / 8.6" OX Locker | 28 Spline (2.73 & Up)
Price: $899.00

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.
OX Locker
GM 8.5" / 8.6" OX Locker | 30 Spline (2.73 & Up)
Price: $899.00

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.
ARB Air Locker
GM 8.5" / 8.6" ARB Air Locker | 30 Spline (2.73 & Up)
List Price: $1,360.45
Your Price: $1,183.00

ARB Air Lockers use compressed air to engage and disengage their internal locking mechanism at the simple flip of a switch. They feature components and gears that are 30% stronger than OEM differentials to offer superior strength, durability, and off-road traction.
ARB Air Locker
GM 8.5" / 8.6" ARB Air Locker | 28 Spline (2.73 & Up)
List Price: $1,360.45
Your Price: $1,183.00

ARB Air Lockers use compressed air to engage and disengage their internal locking mechanism at the simple flip of a switch. They feature components and gears that are 30% stronger than OEM differentials to offer superior strength, durability, and off-road traction.
Eaton E-Locker
GM 8.5" / 8.6" Eaton E-Locker | 30 Spline (2.73 & Up)
List Price: $1,048.79
Your Price: $911.99

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.
Eaton Detroit TrueTrac
GM 8.5" Eaton Detroit TrueTrac | 28 Spline C-Clip (2.73 & Up)
List Price: $616.58
Your Price: $536.16

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.
Eaton Detroit TrueTrac
GM 8.5" Eaton Detroit TrueTrac | 28 Spline (2.73 & Up)
List Price: $661.66
Your Price: $575.36

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.
Eaton Detroit TrueTrac
GM 8.5" / 8.6" Eaton Detroit TrueTrac | 30 Spline C-Clip (2.73 & Up)
List Price: $618.33
Your Price: $537.68

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.
Detroit Locker
GM 8.5" / 8.6" Detroit Locker | 30 Spline (2.73 & Up)
List Price: $908.49
Your Price: $789.99

Detroit Lockers have a legendary reputation with off-roaders and feature a heavy duty, efficient, and effective design that offers 100% traction to both wheels while still allowing for wheel speed differentiation for easy turning on the street and other high-traction surfaces.
Detroit Locker
GM 8.5" Detroit Locker | 28 Spline (2.73 & Up)
List Price: $918.45
Your Price: $798.65

Detroit Lockers have a legendary reputation with off-roaders and feature a heavy duty, efficient, and effective design that offers 100% traction to both wheels while still allowing for wheel speed differentiation for easy turning on the street and other high-traction surfaces.
Yukon Grizzly Locker
GM 8.5" / 8.6" Yukon Grizzly Locker | 30 Spline (2.73 & Up)
List Price: $852.13
Your Price: $740.98

Yukon Grizzly Lockers feature internal disengagement gears that are 350% stronger than those used in a Detroit Locker making them more reliable and better suited for aggressive off-road racing. Assembled in the USA and backed by Yukon's industry leading 1 year warranty.
Spartan Locker
GM 8.5" Spartan Locker | 28 Spline
List Price: $426.35
Your Price: $355.29

Spartan Lockers are ratchet style lockers that replace the spider gears in your stock differential to provide traction to both wheels when it is needed most. They are affordable, don't require removing the carrier for installation, and are covered by a one year warranty.
Spartan Locker
GM 8.5" Spartan Locker | 30 Spline
List Price: $426.35
Your Price: $355.29

Spartan Lockers are ratchet style lockers that replace the spider gears in your stock differential to provide traction to both wheels when it is needed most. They are affordable, don't require removing the carrier for installation, and are covered by a one year warranty.
Yukon Spool
GM 8.5" Yukon Full Spool | 28 Spline
List Price: $351.73
Your Price: $305.85

Yukon Performance Spools are made of the highest quality materials and are the ultimate traction aid for full size trucks, high horsepower applications, and off-road racing. They are designed to replace your entire differential carrier and are backed by a 1 year warranty.
Yukon Spool
GM 8.5" Yukon Full Spool | 33 Spline
List Price: $442.90
Your Price: $385.13

Yukon Performance Spools are made of the highest quality materials and are the ultimate traction aid for full size trucks, high horsepower applications, and off-road racing. They are designed to replace your entire differential carrier and are backed by a 1 year warranty.
Yukon Spool
GM 8.5" / 8.6" Yukon Full Spool | 30 Spline
List Price: $329.22
Your Price: $286.28

Yukon Performance Spools are made of the highest quality materials and are the ultimate traction aid for full size trucks, high horsepower applications, and off-road racing. They are designed to replace your entire differential carrier and are backed by a 1 year warranty.
Yukon Mini Spool
GM 8.5" Yukon Mini Spool | 28 Spline
List Price: $136.01
Your Price: $118.27

Yukon Mini Spools are an effective and affordable way to give your axle full traction to both wheels at all times by simply replacing the spider gears in your open differential. Sold as off-road and race use only and backed by a 1 year warranty.
Yukon Mini Spool
GM 8.5" Yukon Mini Spool | 30 Spline
List Price: $154.56
Your Price: $134.40

Yukon Mini Spools are an effective and affordable way to give your axle full traction to both wheels at all times by simply replacing the spider gears in your open differential. Sold as off-road and race use only and backed by a 1 year warranty.
Yukon Master Ring and Pinion Install Kit
GM 8.6" Yukon Master Overhaul Kit | '99 to '08
List Price: $261.81
Your Price: $227.66

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.
Yukon Master Ring and Pinion Install Kit
GM 8.6" Yukon Master Overhaul Kit | '09 and Newer
List Price: $278.92
Your Price: $242.54

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.
Yukon Master Ring and Pinion Install Kit
GM 8.6" IRS Yukon Master Overhaul Kit | '10 and Newer V8 Camaro
List Price: $512.95
Your Price: $446.04

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.
Yukon Master Ring and Pinion Install Kit
GM 8.5" Yukon Master Overhaul Kit | Rear
List Price: $191.60
Your Price: $166.61

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.
Yukon Master Ring and Pinion Install Kit
GM 8.5" Yukon Master Overhaul Kit | Front
List Price: $245.96
Your Price: $213.88

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.
Yukon Master Ring and Pinion Install Kit
GM 8.5" Yukon Master Overhaul Kit | HD Rear (for Eaton Lockers)
List Price: $261.81
Your Price: $227.66

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.
Yukon Master Ring and Pinion Install Kit
GM 8.5" Yukon Master Overhaul Kit | HD Front (for Eaton Lockers)
List Price: $261.81
Your Price: $227.66

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.
Yukon Master Ring and Pinion Install Kit
GM 8.5" Yukon Master Overhaul Kit | Oldsmobile 28 Spline
List Price: $269.77
Your Price: $234.58

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.
Yukon Master Ring and Pinion Install Kit
GM 8.5" Yukon Master Overhaul Kit | Oldsmobile 31 Spline
List Price: $269.77
Your Price: $234.58

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.
Yukon Minor Ring and Pinion Install Kit
GM 8.5" Yukon Minor Overhaul Kit | Rear
List Price: $42.58
Your Price: $38.14

Yukon minor overhaul kits include all of the seals, shims, and small parts you need to install new ring and pinion gears or add a differential locker (using the existing bearings). Every part is of the highest quality and made specifically for each axle application.
Yukon Minor Ring and Pinion Install Kit
GM 8.5" Yukon Minor Overhaul Kit | Front
List Price: $70.51
Your Price: $61.31

Yukon minor overhaul kits include all of the seals, shims, and small parts you need to install new ring and pinion gears or add a differential locker (using the existing bearings). Every part is of the highest quality and made specifically for each axle application.
Yukon Minor Ring and Pinion Install Kit
GM 8.5" Yukon Minor Overhaul Kit | Oldsmobile 28 Spline
List Price: $129.03
Your Price: $112.20

Yukon minor overhaul kits include all of the seals, shims, and small parts you need to install new ring and pinion gears or add a differential locker (using the existing bearings). Every part is of the highest quality and made specifically for each axle application.
Yukon Minor Ring and Pinion Install Kit
GM 8.5" Yukon Minor Overhaul Kit | Oldsmobile 31 Spline
List Price: $128.39
Your Price: $111.64

Yukon minor overhaul kits include all of the seals, shims, and small parts you need to install new ring and pinion gears or add a differential locker (using the existing bearings). Every part is of the highest quality and made specifically for each axle application.
Yukon Minor Ring and Pinion Install Kit
GM 8.6" Yukon Minor Overhaul Kit
List Price: $71.15
Your Price: $62.52

Yukon minor overhaul kits include all of the seals, shims, and small parts you need to install new ring and pinion gears or add a differential locker (using the existing bearings). Every part is of the highest quality and made specifically for each axle application.
Yukon Minor Ring and Pinion Install Kit
GM 8.6" IRS Yukon Minor Overhaul Kit | '10 and Newer V8 Camaro
List Price: $140.63
Your Price: $122.29

Yukon minor overhaul kits include all of the seals, shims, and small parts you need to install new ring and pinion gears or add a differential locker (using the existing bearings). Every part is of the highest quality and made specifically for each axle application.
Mr. Gasket Ring Gear Spacer
GM 8.5" / 8.6" Ring Gear Spacer
List Price: $103.43
Your Price: $89.94

Mr. Gasket Ring Gear Spacers allow you to run standard cut high gears on a low gear differential carrier. They are precision stamped and ground for perfect parallel alignment and include new ring gear bolts.
Yukon Gear and Axle Ring and Pinion Sets
GM 8.5" / 8.6" Yukon Ring and Pinion Gears | 2.73
List Price: $419.53
Your Price: $364.81

Yukon ring and pinion gears are built for heavy duty applications like racing, towing, and rock crawling. They're machined from the finest materials using modern gear grinding technology to give each set superior strength and the smoothest and most precise finish.
Yukon Gear and Axle Ring and Pinion Sets
GM 8.5" / 8.6" Yukon Ring and Pinion Gears | 3.08
List Price: $481.65
Your Price: $418.83

Yukon ring and pinion gears are built for heavy duty applications like racing, towing, and rock crawling. They're machined from the finest materials using modern gear grinding technology to give each set superior strength and the smoothest and most precise finish.
Yukon Gear and Axle Ring and Pinion Sets
GM 8.5" / 8.6" Yukon Ring and Pinion Gears | 3.23
List Price: $362.93
Your Price: $315.59

Yukon ring and pinion gears are built for heavy duty applications like racing, towing, and rock crawling. They're machined from the finest materials using modern gear grinding technology to give each set superior strength and the smoothest and most precise finish.
Yukon Gear and Axle Ring and Pinion Sets
GM 8.5" / 8.6" Yukon Ring and Pinion Gears | 3.42
List Price: $362.93
Your Price: $315.59

Yukon ring and pinion gears are built for heavy duty applications like racing, towing, and rock crawling. They're machined from the finest materials using modern gear grinding technology to give each set superior strength and the smoothest and most precise finish.
Yukon Gear and Axle Ring and Pinion Sets
GM 8.5" / 8.6" Yukon Ring and Pinion Gears | 3.73
List Price: $362.93
Your Price: $315.59

Yukon ring and pinion gears are built for heavy duty applications like racing, towing, and rock crawling. They're machined from the finest materials using modern gear grinding technology to give each set superior strength and the smoothest and most precise finish.
Yukon Gear and Axle Ring and Pinion Sets
GM 8.5" / 8.6" Yukon Ring and Pinion Gears | 4.11
List Price: $387.21
Your Price: $336.70

Yukon ring and pinion gears are built for heavy duty applications like racing, towing, and rock crawling. They're machined from the finest materials using modern gear grinding technology to give each set superior strength and the smoothest and most precise finish.
Yukon Gear and Axle Ring and Pinion Sets
GM 8.5" / 8.6" Yukon Ring and Pinion Gears | 4.56
List Price: $362.93
Your Price: $315.59

Yukon ring and pinion gears are built for heavy duty applications like racing, towing, and rock crawling. They're machined from the finest materials using modern gear grinding technology to give each set superior strength and the smoothest and most precise finish.
Yukon Gear and Axle Ring and Pinion Sets
GM 8.5" / 8.6" Yukon Ring and Pinion Gears | 4.88
List Price: $362.93
Your Price: $315.59

Yukon ring and pinion gears are built for heavy duty applications like racing, towing, and rock crawling. They're machined from the finest materials using modern gear grinding technology to give each set superior strength and the smoothest and most precise finish.
Yukon Gear and Axle Ring and Pinion Sets
GM 8.5" / 8.6" Yukon Ring and Pinion Gears | 5.13
List Price: $362.93
Your Price: $315.59

Yukon ring and pinion gears are built for heavy duty applications like racing, towing, and rock crawling. They're machined from the finest materials using modern gear grinding technology to give each set superior strength and the smoothest and most precise finish.
Yukon Gear and Axle Ring and Pinion Sets
GM 8.5" / 8.6" Yukon Ring and Pinion Gears | 5.38
List Price: $362.93
Your Price: $315.59

Yukon ring and pinion gears are built for heavy duty applications like racing, towing, and rock crawling. They're machined from the finest materials using modern gear grinding technology to give each set superior strength and the smoothest and most precise finish.
Yukon Gear and Axle Ring and Pinion Sets
GM 8.5" / 8.6" Yukon Ring and Pinion Gears | 5.57
List Price: $611.27
Your Price: $531.54

Yukon ring and pinion gears are built for heavy duty applications like racing, towing, and rock crawling. They're machined from the finest materials using modern gear grinding technology to give each set superior strength and the smoothest and most precise finish.
   
 
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