 |
Evolutionary
Time Period |
Years / Models Used In |
Ring
Gear
Dia. |
Pinion |
Factory
Gear Ratios
(Separated by Case Sizing) |
Positraction Case Casting No. |
Dia. |
No. of Splines |
| First Style |
'55-'64 - All GM cars; drop-out
style |
8.20" |
- |
17 |
- |
- |
| Early Style
Standard |
- '64-'72
Chevelle/GTO/F-85
- '64-'72 Nova/Chevy II
- '67-'70 Camaro |
8.20" |
1.438" |
25 |
2.56, 2.73 |
ED-32267 or
ED-32118 |
| 3.08, 3.36, 3.55, 3.70 |
ED-30116 PM2 |
| Early Style
Other |
-
'64-'71Buick/Pontiac/Oldsmobile
"B or P axles" |
8.25" |
1.438" |
27 |
- |
- |
| Late Style |
- '70-'76
Chevelle/GTO/F-85/LeMans
- '70-'76 Camaro
- '70-'75 Nova/Chevy II
- '77-'81 Z-28/Trans Am |
8.50" |
1.625" |
30 |
2.41, 2.56 |
410409N |
| 2.73, 3.08, 3.42, 3.73, 4.10 |
410408N |
| H Car Style
(light duty) |
- '71-'77 Vega
- '75-'77 4-cyl. Monza, Sunbird, and Astre |
6.50" |
- |
- |
- |
- |
| H Car Style
(med. duty) |
- '75-'77 6- & 8-cyl.
Monza, Sunbird, Starfire and Skyhawk |
7.50" |
- |
- |
- |
- |
| Present Style |
- '77-'84 All GM
models except Monza, Vega and '77-'81 Trans Am's and Z-28's |
7.50" |
1.438" |
27 |
2.29, 2.41, 2.56, 2.73, 2.93,
3.08 |
- |
| 3.23, 3.42, 3.73 |
- |
|
|
