The rear axle identification code consists of a two letter prefix indicating the gear ratio, four digits indicating the assembly date as month/day, and a single letter suffix indicating the manufacturing location. The identification code should be stamped on the bottom or front left or right axle tube either adjacent to the carrier housing or about 8" - 10" inboard from the backing plates.
| Prefix | Axle Ratio |
| CA | 3.08:1 |
| CB | 3.36:1 |
| CC | 3.73:1 |
| CD | 3.07:1 ~ Positraction |
| CE | 3.08:1 ~ Positraction |
| CF | 3.31:1 ~ Positraction |
| CG | 3.36:1 ~ Positraction |
| CH | 3.70:1 ~ w/ Metallic Brakes |
| CI | 3.73:1 ~ Positraction |
| CJ | 3.07:1 ~ w/Metallic Brakes |
| CK | 3.07:1 ~ Positraction w/Metallic Brakes |
| CL | 3.08:1 ~ w/Metallic Brakes |
| CM | 3.08:1 ~ Positraction w/Metallic Brakes |
| CN | 3.31:1 ~ w/Metallic Brakes |
| CO | 3.31:1 ~ Positraction w/Metallic Brakes |
| CP | 3.36:1 ~ w/Metallic Brakes |
| CQ | 3.36:1 ~ Positraction w/Metallic Brakes |
| CR | 3.70:1 ~ Positraction |
| CS | 3.70:1 ~ Positraction w/Metallic Brakes |
| CT | 3.73:1 ~ w/Metallic Brakes |
| CU | 3.70:1 ~ Positraction w/Metallic Brakes |
| CV | 3.70:1 ~ Overdrive |
| CW | 3.31:1 |
| CX | 3.07:1 |
| KC | 2.73:1 ~ w/Metallic Brakes |
| KD | 2.73:1 ~ Positraction |
| KE | 2.73:1 ~ Positraction w/Metallic Brakes |
| KF | 3.55:1 ~ w/Metallic Brakes |
| KG | 3.55:1 ~ Positraction w/Metallic Brakes |
| KH | 3.55:1 ~ Positraction |
| KI | 2.73:1 ~ "396" w/Powerglide |
| KJ | 3.55:1 |
| KK | 4.10:1 ~ Positraction |
| KL | 4.10:1 ~ Positraction w/Metallic Brakes |
| KM | 4.56:1 ~ Positraction |
| KN | 4.56:1 ~ Positraction w/Metallic Brakes |
| KO | 4.88:1 ~ Positraction |
| KP | 4.88:1 ~ Positraction w/Metallic Brakes |