1972 Chevelle Rear Axle & Differential Identification
Casting Numbers
These are the casting numbers used during this production year. If they were used during another year, you will find the additional years listed below.
10 Bolt Housings |
Casting |
Year |
3969277NF |
1970 |
3969277NF |
1971 |
3969277NF |
1972 |
12 Bolt Housings |
Casting |
Year |
3969278NF |
1970 |
3969278NF |
1971 |
3969278NF |
1972 |
Decoding Rear Axle Codes
The rear axle identification code is stamped on the axle housing on the bottom, front left, or front right axle tube next to the carrier housing or about 8 to 12 inches from the backing plates. This code consists of 6 or 7 digits and characters indicating the stock gear ratio, month/day of assembly, and the assembly plant. Sometimes you will find an extra character stamped near this code, E indicates Eaton positraction.
For example: GFC0681 decodes this way: GF / C / 068 / 1.
- The first and second letters indicate the stock gear ratio. GF is a 3.08 axle.
- The third letter indicates the assembly plant. C is for Chevrolet.
- The fourth, fifth, and sixth numbers indicate the day of production. 068 is for the March 9th.
- The seventh number indicates the plant shift number, 1 is for the day shift (if present).
Code |
Gear Ratio |
Notes |
CF |
3.31 |
Positraction |
CH |
2.73 |
Positraction |
CW |
3.31 |
|
GA |
2.56 |
|
GC |
2.73 |
|
GD |
2.73 |
Positraction |
GF |
3.08 |
|
GG |
3.36 |
|
GH |
2.73 |
|
GI |
3.36 |
Positraction |
GN |
3.08 |
|
KD |
2.73 |
|
RU |
3.31 |
|
RV |
3.31 |
Positraction |
RW |
4.10 |
Positraction |
Code |
Assembly Plant |
B |
Buick |
C |
Chevrolet |
G |
Chevrolet |
K |
McKinnon Industries |
M |
McKinnon Industries |
O |
Oldsmobile |
P |
Pontiac |
Code |
Plant Shift |
1 |
Day Shift |
2 |
Night Shift |