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GM8.875" 12 Bolt Truck DIFFERENTIAL COMPONENT PARTS


We offer a complete line of rear end parts for the GM 8.875" commonly refered to as the 12 Bolt truck differential, this differential was utalized GM used this very popular differential in there full size Chevrolet trucks starting in 1964 to 1982. Our inventory includes ring gear and pinion sets, including aftermarket and OE gear sets. We are able to supply axles, bearing overhaul kits, carriers, cases, spider and side gears. Positraction units we offer include Lockrights by Powertrax, Auburn, Detroit Lockers, Trac Loc and ARB air lockers. We are a Dana Spice volume distributor and offer a complete line or ring gear and pinions to the large Dana 80 differential. In addition to the Dana Spicer line we quality offer differential products.

Specifications are provided below to assist you in the identification and setup as well as torque spec's for your Chevy or GM 8.875" differential.

GM 8.875" 12 Bolt Applications 1/2 & 3/4 ton trucks

Model Year
G20, G25 64-82
G10, G15 64-81
K10, K15, C10, C15 64-82

What differential ratio do you have?

Need information on how to setup ring and pinion backlash

Purchase your parts @ drivetrain.com and receive telephone access to experienced differential technician to assist you with installation, we help you solve the problem.

11-1/2"
12 HOLES
Irregular Gasket Pattern

SPECIFICATIONS

  • RG Diameter 8.875"
  • 12 3/8" X 24 RH Threaded Bolts
  • PINION Diameter 1.438", 30 Spline

    CASE: 2.56 -2.73, 2.76-3.42 & 3.73 Numerically Higher

    8620 Material Heat-Treated

    Assembly Specifications:

  • Cover Bolt Ft. Lbs. 20
  • Pinion Brg. Preload In. Lbs 24-25
  • Pinion Brg. Preload In. Lbs 10-15 Used
  • Ring Gear Backlash .005-.009
  • Ring Gear Bolt to case Ft. Lbs. 90
  • Side Brg. Caps Ft. Lbs. 60

GM 8.875" 12 Bolt Differential Ring Gear and Pinion Sets

Quaility Gears provide guaranteed performance

This new Redline synthetic gear oil is recommended for replacement when replacing ring gear pinion sets and or bearings, your cost only $9.95 qt. See other Red Line Oil Products that we recommend.
Part Number OE Number

Ratio

Teeth

Price

GM12-308

3.08

40-13

$214.94

GM12-342

3.42

41-12

$214.94

GM12-373

3.73

41-11

$214.94

GM12-373X*

3.73

41-11

$214.94

GM12-411  

4.11

39-9

$214.94

GM12-411X*

4.11

37-9

$214.94

GM12-456  

4.56

41-9

$214.94

*Fits 2.76 go 3.42 Case

GM 8.875" 12 Bolt Differential Parts

Description

Part Number

Price

 
Case, Empty Open 8.875" 3.73 -UP

6258086

$185.25

 
Case, Empty Open 8.875" 3.42 -Down

6258088

$395.00

 
Bearing/Overhaul Kit 8.875" Rear

DTSR12RMK

$102.82

Internal Kit 8.875" 30 spline Open (spider/side gears, cross shaft thrust washer)

GM12BI

$116.26

Axle 30 Spline, 65-69 30 3/4" long 6 holes R&L

PA6068

$142.52

Installation Tool, Your Cost $49.98 + S&H

Axle 30 Spline, 65-69, 6 hole to 5 hole conversion L&R. 30 3/4" length.

PA5855

$157.57

Axle 30 Spline 4wd 70-81 31 9/32" length 6 hole

PA5383

$136.86

Axle 30 Spline 2wd 70-81 31 5/16" length 5 hole

PA5569

$136.86

 

GM 8.875" 12 Bolt Differential Positraction Units

Description

Part Number

Price





Whats the difference in Positractions?
Differentials whats the Difference
Auburn Limited Slip Positraction 30 Spline

542032

$449.29

Auburn Limited Slip Positraction 30 Spline

542034

$449.29

Detroit Locker 30 Spline

187C150A

$531.20$

Eaton Large Hub GM GM Truck 1961-1980, 30 spline, 3.42 & down

19587-010

$442.86

Recommended replacement for non-repairable non-working GM stock Gov-loc positraciton
Eaton Large Hub GM Truck 1961, to 1980 30 spline, 3.73 & up

19556-10

$442.82

LockRight 1/2 Ton Pickup 30 Spline

1910

$297.72

 
no-Slip Powertrax 30 spline

92-0788-3005

$452.76

General Motors 12 bolt 8.875 inch differential parts and accessories

In addition to the General Motors 12 bolt 8.875 inch differential parts and accessories listed here, we also provide an impressive list of automotive after market products for car, pickup truck, SUV and 4wd repair parts and accessories that includes rear end covers, ring and pinion gears, OE clutches and heavy duty performance clutches, diesel gauge kits, exhaust brakes, re manufactured manual transmissions and both manual and automatic overhaul kits. Other products we offer for the RV recreational vehicle market include REMCO drivelinedisconnects, tow bar and baseplates and auxiliary overdrive units to improve vehicle performance and save fuel. We have a complete 4 wheeling drivetrain product line including complete differential assemblies, limited slip and other solid locking positractions. We offer transmission conversion kits including the NV4500 and NV5600 as well as replacement kits for light duty GM and Jeep transmissions. You may be interested in visiting our Ford and Powerstroke Diesel page, Dodge Ram and other Jeep pages for detailed information.

Watch for future additions of new products to be added to our on-line catalog including advanced wheels, tires, engine tune-up kits and other accessories.

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Considering purchasing parts from drivetrain.com and have questions contact Tech line at 1-702-876-3100 or send e-mail.
Drivetrain Specialists of Las Vegas - Las Vegas NV, 89102


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A Division of Drive Line Service of Las Vegas
Las Vegas Nevada, 89102
(702) 876-3100