1970 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 8 or 9 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: CGD0518B1 decodes this way: CGD / 05 / 18 / B / 1.
- The first, second, and third letters indicate the stock gear ratio. CGD is a 2.73 positraction axle.
- The fourth and fifth numbers indicate the month of production. 05 is for May.
- The sixth and seventh numbers indicate the day of production. 18 is for the 18th.
- The eighth letter indicates the assembly plant. B is for Buffalo, NY.
- The ninth number indicates the plant shift number, 1 is for the day shift (if present).
Code |
Gear Ratio |
Notes |
CCA |
3.08 |
|
CCB |
3.36 |
|
CCD |
3.07 |
Positraction |
CCE |
3.08 |
Positraction |
CCF |
3.31 |
Positraction |
CCG |
3.36 |
Positraction |
CCH |
2.73 |
Positraction |
CCL |
2.56 |
|
CCM |
2.56 |
Positraction |
CCN |
2.56 |
|
CCO |
2.56 |
Positraction |
CCP |
2.73 |
|
CCW |
3.31 |
|
CCX |
3.07 |
|
CGA |
2.56 |
|
CGB |
2.56 |
Positraction |
CGC |
2.73 |
|
CGD |
2.73 |
Positraction |
CGE |
3.08 |
|
CGF |
3.08 |
Positraction |
CGG |
3.36 |
|
CGI |
3.36 |
Positraction |
CKC |
2.73 |
Positraction |
CKD |
2.73 |
|
CKF |
3.55 |
Positraction |
CKJ |
3.55 |
|
CKK |
4.10 |
|
CRJ |
2.56 |
|
CRK |
2.56 |
Positraction |
CRL |
3.07 |
|
CRM |
3.07 |
|
CRU |
3.31 |
|
CRV |
3.31 |
Positraction |
CRW |
4.10 |
|
Code |
Assembly Plant |
B |
Buffalo, NY |
G |
Chevrolet Gear & Axle |
W |
Warren, MI |
K |
McKinnon Industries |
Code |
Plant Shift |
1 |
Day Shift |
2 |
Night Shift |