1964 to 1969 Axle codes can be found on the bottom, or left or right front Axle tube next to the carrier housing. Additionally, codes can also be found approximately 8" to 10" inside of the backing plates.

CA (3.08)
CB (3.36)
CC (3.73)
CD Positraction (3.07)
CE Positraction (3.08)
CF Positraction (3.31)
CG Positraction (3.36)
CH Positraction (2.73)
CI Positraction (3.73)
CJ w/Metallic Brakes (3.07)
CK Positraction w/Metallic Brakes (3.07)
CL Positraction (2.73)
CM Positraction w/Metallic Brakes (2.73)
CN w/Metallic Brakes (3.31)
CO Positraction w/Metallic Brakes (3.31)
CR Positraction (3.70)
CS w/Metallic Brakes (2.56)
CT w/Metallic Brakes (3.73)
CU Positraction w/Metallic Brakes (3.73)
CV (3.70)
CW (3.31)
CX (3.07)
CY (3.07)
CZ (2.73)
KA (3.55)
KB Positraction (3.55)
KC Positraction (2.73)
KD (2.73)
KE Positraction (2.56)
KF Positraction (3.55)
KG Positraction w/Metallic Brakes (3.55)
KH w/Metallic Brakes (3.55)
KI Positraction w/Metallic Brakes (2.56)
KJ (3.55)
KK Positraction (4.10)
KL w/Metallic Brakes (4.10)
KM Positraction (4.56)
KN w/Metallic Brakes (4.56)
KO Positraction (4.88)
KP w/Metallic Brakes (4.88)
KQ w/Metallic Brakes (2.73)
KR Positraction w/Metallic Brakes (2.73)
KS w/Metallic Brakes (3.07)
KT Positraction w/Metallic Brakes (3.07)
KU w/Metallic Brakes (3.31)
KV Positraction (3.31)
KW Positraction (2.73)
KX Positraction (3.07)
KY (3.31)
KZ (3.31)