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.

CRU = 3.31 Positraction
223 = August 10
B = Buffalo, NY manufacturing location

Prefix Axle Ratio
GD 2.73 ~ Positraction
GF 3.08
CH 2.73 ~ Positraction
GA 2.56
GC 2.73
GG 3.36
GB 2.56 ~ Positraction
GI 3.36 ~ Positraction
KD 2.73
CW 3.31
CF 3.31 ~ Positraction
*RU 3.31
RV 3.31 ~ Positraction
RW 4.10
GH 2.73
GN 3.08

Assembly Date - 3-digit number is Julian day beginning with January 1, 1970.  The day 223 is the 223rd day of 1970, or August 10, 1970.

Rear Axle Assembly Plant - Last character

Code Assembly Plant
*B *Buffalo, N.Y.
G Chevrolet Gear & Axle
W Warren, MI
K McKinnon Industries