1966 Chevelle Rear Axle Identification
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.
Example: CG1025B decodes to CG ~ 3.36
Positraction, 1025 ~ Month [Oct] and Day [25], B ~ Buffalo (G=Chevrolet
Gear & Axle, W=Warren, K=McKinnon Industries). See bottom of page for
more examples.
Casting Numbers:
12-Bolt Casting #3875745N
10-Bolt Casting #3875744N
The casting numbers/letters on rear end housings
may have
either a prefix or suffix of "N" or "NF" and no reason has been found yet why
they may have one or the other.
| Prefix |
Axle Ratio |
| CA |
3.08 |
| CB |
3.36 |
| CC |
3.73 |
| CD |
3.07 ~ Positraction |
| CE |
3.08 ~ Positraction |
| CF |
3.31 ~ Positraction |
| CG |
3.36 ~ Positraction |
| CH |
3.70 ~ w/ Metallic Brakes |
| CI |
3. 73 ~ Positraction |
| CJ |
3.07 ~ w/Metallic Brakes |
| CK |
3.07 ~ Positraction w/Metallic Brakes |
| CL |
3.08 ~ w/Metallic Brakes |
| CM |
3.08 ~ Positraction w/Metallic Brakes |
| CN |
3.31 ~ w/Metallic Brakes |
| CO |
3.31 ~ Positraction w/Metallic Brakes |
| CP |
3.36 ~ w/Metallic Brakes |
| CQ |
3.36 ~ Positraction w/Metallic Brakes |
| CR |
3.70 ~ Positraction |
| CS |
3.70 ~ Positraction w/Metallic Brakes |
| CT |
3.73 ~ w/Metallic Brakes |
| CU |
3.70 ~ Positraction w/Metallic Brakes |
| CV |
3.70 ~ Overdrive |
| CW |
3.31 |
| CX |
3.07 |
| KC |
2.73 ~ w/Metallic Brakes |
| KD |
2.73 ~ Positraction |
| KE |
2.73 ~ Positraction w/Metallic Brakes |
| KF |
3.55 ~ w/Metallic Brakes |
| KG |
3.55 ~ Positraction w/Metallic Brakes |
| KH |
3.55 ~ Positraction |
| KI |
2.73 ~ "396" w/Powerglide |
| KJ |
3.55 |
| KK |
4.10 ~ Positraction |
| KL |
4.10 ~ w/Metallic Brakes |
| KM |
4.56 ~ Positraction |
| KN |
4.56 ~ w/Metallic Brakes |
| KO |
4.88 ~ Positraction |
| KP |
4.88 ~ w/Metallic Brakes |
| Assembly Month
- 1st and 2nd numbers |
| Number |
Month |
Number |
Month |
| 01 |
January |
02 |
February |
| 03 |
March |
04 |
April |
| 05 |
May |
06 |
June |
| 07 |
July |
08 |
August |
| 09 |
September |
10 |
October |
| 11 |
November |
12 |
December |
Assembly Day - 3rd and 4th numbers
01...31
|
Rear Axle Assembly Plant
- 5th letter
|
| Code |
Assembly Plant |
| B |
Buffalo, N.Y. |
| G |
Chevrolet Gear & Axle |
| W |
Warren, MI. |
| K |
McKinnon Industries |
CW 1112 B decodes to CW=3.31 Positraction, 1112=November 12, B is for
Buffalo, N.Y.
CX 0727 B decodes to CX=3.07, 0727=July 27, B is for Buffalo, N.Y.
Want more information on 1966 Chevelles? Take a test drive of my
1966 Chevelle Reference
CD.
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