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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/El Caminos? Take a test drive of
my 1966 Chevelle
Reference CD.
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