1969 Chevelle Rear Axle & Differential Identification

Picture of a rear differential

Casting Numbers

These are the casting numbers used during this production year. If they were used during another year, you will find the additional years listed below.

10 Bolt Housings
Casting Year
3859037NF 1969
12 Bolt Housings
Casting Year
3917124NF 1967 (Late)
3917124NF 1968
3917124NF 1969 (Early)
3959038NF 1969 (Late)

Decoding Rear Axle Codes

The rear axle identification code is stamped on the axle housing on the bottom, front left, or front right axle tube next to the carrier housing or about 8 to 12 inches from the backing plates. This code consists of 7 digits and characters indicating the stock gear ratio, month/day of assembly, and the assembly plant. Sometimes you will find an extra character stamped near this code, E indicates Eaton positraction.

For example: CE1101B decodes this way: CE / 11 / 01 / B.

Code Gear Ratio Notes
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 2.56  
CK 2.56 Positraction
CL 2.56  
CM 2.56 Positraction
CN 2.56  
CO 2.56 Positraction
CP 2.73  
CQ 2.56  
CS 2.56 Positraction
CT 2.73  
CW 3.31  
CX 3.07  
CY 3.07  
CZ 2.73  
FH 2.73  
FI 2.73 Positraction
FJ 3.08  
FK 3.08 Positraction
FL 3.36  
FM 3.36 Positraction
FN 3.55  
FO 3.55 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 2.73 Positraction - Small Ring Gear
KF 3.55 Positraction - Large Ring Gear
KG 3.08 Small Ring Gear
KH 3.08 Positraction - Small Ring Gear
KI 3.36  
KJ 3.55 Large Ring Gear
KK 4.10 Positraction
KL 3.36 Positraction - Small Ring Gear
KM 4.56 Positraction
KN 3.55 Small Ring Gear
KO 4.88 Positraction
KP 3.55 Positraction - Small Ring Gear
KQ 4.10 Positraction - Heavy Duty
KX 3.07 Positraction
Code Assembly Plant
B Buffalo, NY
G Chevrolet Gear & Axle
W Warren, MI
K McKinnon Industries