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Chevrolet GM 8.875" Car Ring and Pinion Sets Differential Parts Print E-mail
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GM 12 bolt car ring and pinion gears

 

laptopcomputergearratio.jpg 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. GM 12 bolt car ring and pinion 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:

 Applications Where Used
   Specificatons
 Ring & Pinions Ratios Available
   Differential Parts Available
 Positraction Units
   

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. motivegear_ligduty_large.jpg

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Specifications

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10-7/8"
12 HOLES
Oval Gasket Pattern


  • RG Diameter 8.875"
  • 12 3/8" X 24 RH Threaded Bolts
  • PINION Diameter 1.625", 30 Spline

    CASE: 3.90 & Down, 4.10 Numerically Higher

    8620 Material Heat-Treated

    Assembly Specifications:

  • Cover Bolt Ft. Lbs. 20
  • Pinion Brg. Preload In. Lbs 20-25
  • 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.

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GM 8.875" 12 Bolt Ring Gear and Pinon Sets

 
Part Number OE Number

Ratio

Teeth

Price

 
G888308  

3.08

40-13

$337.50

 

dial indicator and base set 12 bolt ring and pinion

 

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  Series 4 Case Thin Gear

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    
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GM 8.875" 12 Bolt Differential Parts

     
Description

Part Number

Price

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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

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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

$571.95

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

 
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