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

PrefixAxle Ratio
CA3.08:1
CB3.36:1
CC3.73:1
CD3.07:1 ~ Positraction
CE3.08:1 ~ Positraction
CF3.31:1 ~ Positraction
CG3.36:1 ~ Positraction
CH3.70:1 ~ Positraction w/Metallic Brakes
CI3.73:1 ~ Positraction
CJ3.07:1 ~ Metallic Brakes
CK3.07:1 ~ Positraction w/Metallic Brakes
CL3.08:1 ~ Metallic Brakes
CM3.08:1 ~ Positraction w/Metallic Brakes
*CN*3.31:1 ~ Metallic Brakes
CO3.31:1 ~ Positraction w/Metallic Brakes
CP3.36:1 ~ Metallic Brakes
CQ3.36:1 ~ Positraction w/Metallic Brakes
CH3.70:1 ~ Metallic Brakes
CR3.70:1 ~ Positraction
CS3.70:1 ~ Positraction w/Metallic Brakes
CT3.73:1 ~ Metallic Brakes
CU3.73:1 ~ Positraction w/Metallic Brakes
CV3.70:1 ~ Overdrive
CW3.31:1 ~ 327
CX3.07:1 ~ 327
GA3.31:1 ~ Heavy Duty
GB2.73:1 ~ 327 w/Powerglide
GC2.73:1 ~ Positraction
GD2.73:1 ~ Metallic Brakes
GE2.73:1 ~ Positraction w/Metallic Brakes
Assembly Month - 1st and 2nd numbers
NumberMonthNumberMonth
01January*02*February
03March04April
05May06June
07July08August
09September10October
11November12December

Assembly Day - 3rd and 4th numbers
01...31

Rear Axle Assembly Plant - 5th letter

CodeAssembly Plant
*BBuffalo, New York
GChevrolet Gear & Axle
WWarren, Michigan
KMcKinnon Industries