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.

CN = 3.31 w/metallic brakes
0205 = February 5
B = Buffalo, N.Y. manufacturing location

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 ~ Positraction w/Metallic Brakes
CI 3.73:1 ~ Positraction
CJ 3.07:1 ~ Metallic Brakes
CK 3.07:1 ~ Positraction w/Metallic Brakes
CL 3.08:1 ~ Metallic Brakes
CM 3.08:1 ~ Positraction w/Metallic Brakes
*CN *3.31:1 ~ Metallic Brakes
CO 3.31:1 ~ Positraction w/Metallic Brakes
CP 3.36:1 ~ Metallic Brakes
CQ 3.36:1 ~ Positraction w/Metallic Brakes
CH 3.70:1 ~ Metallic Brakes
CR 3.70:1 ~ Positraction
CS 3.70:1 ~ Positraction w/Metallic Brakes
CT 3.73:1 ~ Metallic Brakes
CU 3.73:1 ~ Positraction w/Metallic Brakes
CV 3.70:1 ~ Overdrive
CW 3.31:1 ~ 327
CX 3.07:1 ~ 327
GA 3.31:1 ~ Heavy Duty
GB 2.73:1 ~ 327 w/Powerglide
GC 2.73:1 ~ Positraction
GD 2.73:1 ~ Metallic Brakes
GE 2.73:1 ~ Positraction 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, New York
G Chevrolet Gear & Axle
W Warren, Michigan
K McKinnon Industries