 Having problems with your GM 12 bolt 8.875 inch rear end? We offer a complete line of rear end parts for the GM 8.875" commonly
refered to as the GM12 Bolt differential, this differential was utalized GM
used this very popular differential in there full size Chevrolets, Chevelle,
Chevy II, Camero, Nova, Oldsmobile F85 and GTO/Firebird Pontiac products starting
in 1965 to 1972. 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
Lockright, Powertrax no-Slip, Auburn, Detroit Lockers , and Eaton.
Below is a list of the information and parts that we can supply for your GM Cheverolet 12 bolt Car applications:
Specifications are provided below to assist you in the identification and setup
as well as torque spec's for your Chevy or GM 8.8755" differential:
GM 8.875" 12 Bolt Applications
| Model |
Year |
|
Model |
Year
|
| Chevrolet |
65-72 |
|
Firebird
GTO |
70-72
|
| Chevy II |
65-72 |
|
Nova |
70-72
|
| Chevelle |
65-72 |
|
Olds F85 |
68-69
|
| Camero |
67-72 |
|
|
|
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.
|
|
Specifications
 |
10-7/8"
12 HOLES
Oval Gasket Pattern
|
|
GM 8.875" 12 Bolt Ring Gear and Pinon Sets
|
|
| Part Number |
OE Number |
Ratio
|
Teeth |
Price
|
|
| G888308 |
|
3.08
|
40-13
|
$337.50
|
Ring Gear Backlash Setup tool
Your Cost $48.98 + S&H.
|
| G888342 |
|
3.42
|
41-12
|
$210.00
|
| G888355 |
|
3.55
|
39-11
|
$210.00
|
| G888373 |
|
3.73
|
41-11
|
$210.00
|
| G888390 |
|
3.90
|
39-10
|
$220.00
|
| G888411 |
|
4.11
|
41-10
|
$210.00
|
| G888411X |
|
4.11
|
41-10
|
$220.00
|
| G888430 |
|
4.30
|
43-10
|
$220.00
|
| G888456 |
|
4.56
|
41-9
|
$220.00
|
| G888456X |
|
4.56
|
41-9
|
$220.00
|
|
| G888488 |
|
4.88
|
39-8
|
$220.00
|
|
| G888488X |
|
4.88
|
39-8
|
$220.00
|
|
| G888514 |
|
5.14
|
36-7
|
$220.00
|
|
| G888538 |
|
5.38
|
43-8
|
$346.91
|
|
| G888557 |
|
5.57
|
39-7
|
$346.91
|
|
| G888586 |
|
5.86
|
41-7
|
$346.91
|
|
| G888614 |
|
6.14
|
43-7
|
$346.91
|
|
| X= Fits 3.07 - 3.73 Case |
|
|
|
GM 8.875" 12 Bolt Differential Parts
|
|
|
|
| Description |
Part Number
|
Price
|
Order above high performance synthetic oil and friction additive
combo kit at time of order for ring and pinion or bearing overhaul kit
and pay only $49.95 plus S&H, a $54.00 value. See other Red
Line Oil Products that we recommend.
|
| Case, Empty 8.875" 3.73 -UP OEM |
6258086
|
$319.93
|
| Bearing/Overhaul Kit 8.875" |
DTSR12CRMK
|
$102.62
|
| Internal Kit 8.875" Open (spider/side gears, cross shaft thrust washer) |
GM12BI
|
$116.00
|
| Axle 30 Spline, 5 holes, R&L. 30 1/16" length. 68-72 Chevelle & El Camino,
70-72 Camero |
PA5769
|
$168.39
|
TOUGH Axles!
Superior Alloy
Induction Hardened
Rolled Splines 35% stronger than cut splines
2 Year Warranty!
|
| Axle 30 Spline, 5 holes, R&L. 29 9/16" length. 68-72 Chevy II, 67-69 Camero,
65-67 Chevelle |
PA5770
|
$168.39
|
|
GM 8.875" 12 Bolt Positraction Differential Options
|
|
|
|
| Description |
Part Number
|
Price
|
Whats the difference in Positractions?
Check out Differentials whats the Difference |
| Auburn Limited Slip Positraction 30 Spline 4.0/up |
542031
|
$475.00
|
| Lockright 30 spline |
1910
|
$297.72
|
| No-Slip Powertrax 30 spline |
92-0788-3005
|
$452.76
|
|
Eaton Positraction Series 3 car, 30 Spline 3.07 to 3.73 more information & video
|
DTS19554-010
|
$485.48
|
Eaton Positraction 4-Series Car 1964 to1972 (800#) 4.10 & Higher 30 spline
|
DTS19510-010 |
$514.60 |
| Eaton Positraction 4-Series Car 1964 to 1972 3.90 & Up |
DTS19555-010 |
$485.48 |
Detroit Locker 30 splines more information & video
|
DTS187C150A |
$808.19 |
We offer a complete line of products to improve the perfromance of your vehicle, check out the following links:
|
Ring and Pinion Sets 
