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Filthy Motorsports: Store > GM 8.875" 12 Bolt
GM 8.875" (8.9") 12 Bolt Passenger (12P) and Truck (12T) Axle Parts and Upgrades

GM 12 Bolt Axle Models:

GM 12P (8.875") (Passenger Car)
GM 12T (8.875") (Truck)

Axle Specifications:

Ring Gear Diameter: 8.875
Diff Cover Bolts: 12
Ring Gear Bolts: 12
Axle Spline Count: 30
Axle Shaft Style: Semi-Floating
C-Clips: Yes
Pinion Support: No
Pinion Nut: 1-1/8"
Pinion Crush Sleeve: Yes
Carrier Breaks: P: 2.76 / 3.07
P: 3.90 / 4.10
T: 2.73 / 2.76
T: 3.42 / 3.73
Dropout Carrier: No

Torque Specifications:

Pinion Preload New: P: 14 to 19 in-lbs
T: 13 to 15 in-lbs
Pinion Preload Reused: P: 6 to 8 in-lbs
T: 6 to 7 in-lbs
Ring Gear Backlash: .006" to .010"
Ring Gear Bolt Torque: 55 ft-lbs
Carrier Bearing Caps: 60 ft-lbs

Popular Applications:

Chevy Bel Air 1964 - 1972 Rear
Chevy Camaro 1967 - 1972 Rear
Pontiac GTO 1970 - 1972 Rear
Chevy Nova 1964 - 1972 Rear
Chevy C10 / C15 1963 - 1987 Rear
Chevy Suburban 1963 - 1987 Rear
GMC K5 / K10 / K15 1963 - 1987 Rear

Axle Images:



Axle Details

The GM 8.875" (often rounded to 8.9") 12 Bolt axle is available in passenger car (GM 12P) and truck (GM 12T) rear axle configurations and features an 8.875" ring gear and 30 spline semi floating axle shafts. While both versions of the axle have similar specifications on paper, they do have unique differential carrier housings and most parts, including ring and pinion gears are not interchangeable. Because both axles are commonly referred to as GM 12 Bolt axles, it is important to know which version you have before ordering your parts. The easiest way to tell them apart is that the passenger car version has a perfectly round differential cover while the truck version has an irregular shape.

Note: This axle has a Carrier Break and gear changes may require a different carrier or thick gears.
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ARB Air Locker
GM 12 Bolt Truck / GM 12T ARB Air Locker | 30 Spline (3.73 & Up)
List Price: $1,081.58
Your Price: 940.50

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.
Detroit Locker
GM 12 Bolt Truck / GM 12T Detroit Locker | 30 Spline (3.73 & Up)
List Price: $824.35
Your Price: 689.95

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 12 Bolt Passenger / GM 12P Detroit Locker | 30 Spline (3.08 - 3.90)
List Price: $824.35
Your Price: 689.95

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 12 Bolt Passenger / GM 12P Detroit Locker | 35 Spline (3.08 - 3.90)
List Price: $824.35
Your Price: 689.95

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 12 Bolt Passenger / GM 12P Detroit Locker | 33 Spline (3.08 - 3.90)
List Price: $700.99
Your Price: 690.95

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.
Eaton Detroit TrueTrac
GM 12 Bolt Truck / GM 12T Eaton Detroit TrueTrac | 30 Spline (3.73 & Up)
List Price: $596.58
Your Price: 519.95

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 12 Bolt Passenger / GM 12P Eaton Detroit TrueTrac | 30 Spline (3.08 - 3.90)
List Price: $570.40
Your Price: 499.95

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 12 Bolt Passenger / GM 12P Eaton Detroit TrueTrac | 33 Spline (4.10 & Up)
List Price: $590.35
Your Price: 519.95

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 12 Bolt Passenger / GM 12P Eaton Detroit TrueTrac | 33 Spline (3.08 - 3.90)
List Price: $590.35
Your Price: 519.95

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.
Spartan Locker
GM 12 Bolt Spartan Locker | 30 Spline
List Price: $463.97
Your Price: 386.64

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 12 Bolt Passenger / GM 12P Yukon Full Spool | 30 Spline (4.10 & Up)
List Price: $284.21
Your Price: 247.14

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 12 Bolt Passenger / GM 12P Yukon Full Spool | 33 Spline (4.10 & Up)
List Price: $316.11
Your Price: 274.88

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 12 Bolt Truck / GM 12T Yukon Full Spool | 30 Spline (3.73 & Up)
List Price: $336.87
Your Price: 292.93

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 12 Bolt Yukon Mini Spool | 30 Spline
List Price: $162.97
Your Price: 141.71

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 12 Bolt Passenger / GM 12P Yukon Master Overhaul Kit
List Price: $213.66
Your Price: 185.79

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 12 Bolt Truck / GM 12T Yukon Master Overhaul Kit
List Price: $219.22
Your Price: 190.63

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 12 Bolt Passenger / GM 12P Yukon Minor Overhaul Kit
List Price: $108.59
Your Price: 94.43

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 12 Bolt Truck / GM 12T Yukon Minor Overhaul Kit
List Price: $108.59
Your Price: 94.43

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 12 Bolt Passenger / GM 12P Ring Gear Spacer
List Price: $128.18
Your Price: 111.46

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.
Mr. Gasket Ring Gear Spacer
GM 12 Bolt Truck / GM 12T Ring Gear Spacer

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 12 Bolt Passenger / GM 12P Yukon Ring and Pinion Gears | 3.08
List Price: $430.32
Your Price: 374.19

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 12 Bolt Passenger / GM 12P Yukon Ring and Pinion Gears | 3.42
List Price: $282.99
Your Price: 246.08

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 12 Bolt Passenger / GM 12P Yukon Ring and Pinion Gears | 3.55
Your Price: $282.99
Sale Price: 246.08

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 12 Bolt Passenger / GM 12P Yukon Ring and Pinion Gears | 3.73
List Price: $282.99
Your Price: 246.08

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 12 Bolt Passenger / GM 12P Yukon Ring and Pinion Gears | 3.73 (Thin)
List Price: $384.27
Your Price: 334.15

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 12 Bolt Passenger / GM 12P Yukon Ring and Pinion Gears | 3.90
List Price: $367.74
Your Price: 319.77

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 12 Bolt Passenger / GM 12P Yukon Ring and Pinion Gears | 4.11
List Price: $288.94
Your Price: 251.25

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 12 Bolt Passenger / GM 12P Yukon Ring and Pinion Gears | 4.30
List Price: $463.14
Your Price: 402.73

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 12 Bolt Passenger / GM 12P Yukon Ring and Pinion Gears | 4.56
List Price: $435.16
Your Price: 378.40

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 12 Bolt Passenger / GM 12P Yukon Ring and Pinion Gears | 4.88
List Price: $463.05
Your Price: 402.65

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 12 Bolt Passenger / GM 12P Yukon Ring and Pinion Gears | 5.13
List Price: $418.42
Your Price: 363.84

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 12 Bolt Passenger / GM 12P Yukon Ring and Pinion Gears | 5.38
List Price: $379.70
Your Price: 330.17

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 12 Bolt Passenger / GM 12P Yukon Ring and Pinion Gears | 5.57

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 12 Bolt Passenger / GM 12P Yukon Ring and Pinion Gears | 3.90 (Thin)

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 12 Bolt Passenger / GM 12P Yukon Ring and Pinion Gears | 4.11 (Thick)
List Price: $369.84
Your Price: 321.60

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 12 Bolt Passenger / GM 12P Yukon Ring and Pinion Gears | 4.56 (Thick)
List Price: $463.05
Your Price: 402.65

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 12 Bolt Truck / GM 12T Yukon Ring and Pinion Gears | 3.08
List Price: $339.53
Your Price: 295.24

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 12 Bolt Truck / GM 12T Yukon Ring and Pinion Gears | 3.42
List Price: $298.33
Your Price: 259.42

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 12 Bolt Truck / GM 12T Yukon Ring and Pinion Gears | 3.73
List Price: $304.23
Your Price: 264.55

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 12 Bolt Truck / GM 12T Yukon Ring and Pinion Gears | 4.11
List Price: $298.33
Your Price: 259.42

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 12 Bolt Truck / GM 12T Yukon Ring and Pinion Gears | 4.56
List Price: $304.23
Your Price: 264.55

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 12 Bolt Truck / GM 12T Yukon Ring and Pinion Gears | 4.88
List Price: $346.78
Your Price: 301.55

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 12 Bolt Truck / GM 12T Yukon Ring and Pinion Gears | 5.13
List Price: $340.29
Your Price: 295.90

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 12 Bolt Truck / GM 12T Yukon Ring and Pinion Gears | 5.38

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 12 Bolt Truck / GM 12T Yukon Ring and Pinion Gears | 4.11 (Thick)
List Price: $298.33
Your Price: 259.42

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 12 Bolt Truck / GM 12T Yukon Ring and Pinion Gears | 4.56 (Thick)
List Price: $298.33
Your Price: 259.42

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 12 Bolt Passenger / GM 12P Yukon Ring and Pinion Gears | 3.31
List Price: $325.44
Your Price: 282.99

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 12 Bolt Truck / GM 12T Yukon Ring and Pinion Gears | 3.73 (Thick)
List Price: $298.33
Your Price: 259.42

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 12 Bolt Truck / GM 12T Yukon Ring and Pinion Gears | 4.88 (Thick)

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 12 Bolt Passenger / GM 12P Yukon Ring and Pinion Gears | 6.00
List Price: $463.05
Your Price: 402.65

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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