Team Chevelle

1966 Chevelle Differential Codes

Rear Axle Code information is stamped on the axle housing for this year.. contains a 7 digit code that tells the stock ratio, month / day of build as well as the production facility, either W - Warren or B - Buffalo
Format is: CA0403B for a 3.08 rear ratio built on April 3rd at the Buffalo plant.

Rear Numerical Codes
Code Positraction Ratio 10 / 12 Bolt
CA 3.08 10
CB 3.36 10
CC 3.73 12
CD X 3.07 12
CE X 3.08 10
CF X 3.31 12
CG X 3.36 10
CH 3.70 10
CI X 3.73 12
CJ 3.07 12
CK X 3.07 12
CL 3.08 10
CM X 3.08 10
CN 3.31 12
CO X 3.31 12
CP 3.36 10
CQ X 3.36 10
CR X 3.70 10
CS X 3.70 10
CT 3.73 12
CU X 3.73 12
CV 3.70 10
CW 3.31 12
CX 3.07 12
KF 3.55 12
KG X 3.55 12
KH X 3.55 12
KI 2.73 12
KJ 3.55 12
KL 4.10 12
KN 4.56 12
KP 4.88 12
KK X 4.10 12
KM X 4.56 12
KO X 4.88 12

1966