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.

FL = 3.36
0527 = May 27
W = Warren, MI manufacturing location

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 2.73 ~ Positraction
CI 3.73 ~ Positraction
CJ 3.07
CK 3.07
CL 2.73
CM 2.73 ~ Positraction
CN 3.31
CO 3.31 ~ Positraction
CP 2.73
CQ 2.56
CR 3.70 ~ Positraction
CS 2.56
CT 3.73
CU 3.73 ~ Positraction w/Metallic Brakes
CV 3.70
CW 3.31
CX 3.07
CY 3.07
CZ 2.73
FH 2.73 ~ small ring gear
FI 2.73 ~ Positraction ,small ring gear
FJ 3.08
FK 3.08 ~ Positraction
*FL *3.36
FM 3.36 ~ Positraction
FN 3.55 ~ small ring gear
FO 3.55 ~ Positraction, small ring gear
FP 3.70
FQ 3.70 ~ Positraction
K2 3.55
K3 3.55 ~ Positraction
K4 3.73
K5 3.73 ~ Positraction
K6 4.10 ~ Positraction
K7 4.56 ~ Positraction
K8 4.88 ~ Positraction
KA 3.55 ~ small ring gear
KB 3/55 ~ Positraction, small ring gear
KC 2.73 ~ Positraction, small ring gear
KD 2.73 ~ large ring gear
KE 2.56 ~ Positraction
KF 3.55 ~ Positraction, large ring gear
KG 3.55 ~ Positraction
KH 3.55
KI 2.56
KJ 3.55 ~ large ring gear
KK 4.10 ~ Positraction
KL 4.10
KM 4.56 ~ Positraction
KN 4.56
KO 4.88 ~ Positraction
KP 4.88
KQ 2.73
KR 2.73 ~ Positraction
KS 3.07
KT 3.07 ~ Positraction
KU 3.31
KV 3.31 ~ Positraction
KW 2.73 ~ w/Metallic Brakes
KX 3.07 ~ Positraction
KY 3.31 ~ Positraction
KZ 3.31
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, NY
G Chevrolet Gear & Axle
*w *Warren, MI
K McKinnon Industries