1967 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
3894938NF 1967
12 Bolt Housings
Casting Year
3894939NF 1967 (Early)
3917124NF 1967 (Late)
3917124NF 1968
3917124NF 1969 (Early)

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: KF0517B decodes this way: KF / 05 / 17 / 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 3.07 Metallic Brakes
CK 3.07 Positraction w/ Metallic Brakes
CL 2.73 Positraction
CM 2.73 Positraction w/ Metallic Brakes
CN 3.31 Metallic Brakes
CO 3.31 Positraction w/ Metallic Brakes
CR 3.73 Positraction
CS 2.56 Metallic Brakes
CT 3.73 Metallic Brakes
CU 3.73 Positraction w/ Metallic Brakes
CV 3.70  
CW 3.31  
CX 3.07  
CY 3.07  
CZ 2.73  
KA 3.55  
KB 3.55 Positraction
KC 2.73 Positraction
KD 2.73  
KE 2.56 Positraction
KF 3.55 Positraction
KG 3.55 Positraction w/ Metallic Brakes
KH 3.55 Metallic Brakes
KI 2.56 Positraction w/ Metallic Brakes
KJ 3.55  
KK 4.10 Positraction
KL 4.10 Metallic Brakes
KM 4.56 Positraction
KN 4.56 Metallic Brakes
KO 4.88 Positraction
KP 4.88 Metallic Brakes
KQ 2.73 Metallic Brakes
KR 2.73 Positraction w/ Metallic Brakes
KS 3.07 Metallic Brakes
KT 3.07 Positraction w/ Metallic Brakes
KU 3.31 Metallic Brakes
KV 3.31 Positraction
KW 2.73 Positraction
KX 3.07 Positraction
KY 3.31  
KZ 3.31  
Code Assembly Plant
B Buffalo, NY
G Chevrolet Gear & Axle
W Warren, MI
K McKinnon Industries