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. The warranty card Protect-O-Plate may show a 3-letter prefix such as CRV for RV.

CH = 2.73
221 = August 16 (1971) - E = Eaton Positraction

Prefix Axle Ratio
GD 2.73:1 ~ Positraction
GF 3.08:1
*CH 2.73:1 ~ Positraction
GA 2.56:1
GC 2.73:1
GG 3.36:1
GB 2.56:1 ~ Positraction
GI 3.36:1 ~ Positraction
KD 2.73:1
CW 3.31:1
CF 3.31:1 ~ Positraction
RU 3.31:1
RV 3.31:1 ~ Positraction
RW 4.10:1 ~ Positraction
GH 2.73:1
GN 3.08:1
   
Assembly Month - Julian days beginning with January 1, 1971
Number Month Number Month
00-31 January 1971
32-59 February, 1971
60-90 March 1971 91-120 April 1971
121-151 May 1971 152-181 June 1971
182-212 July 1971 213-243 August 1971
244-273 September 1971 274-304 October 1971
305-334 November 1971 335-365 December 1971
366-396 January 1972
397-425 February 1972
426-456 March 1972
456-486 April 1972
487-517 May 1972 518-547 June 1972
548-578 July 1972    
       
Code Assembly Plant    
C Buffalo, NY    
G Detroit Gear & Axle    
K McKinnon Industries (GM of Canada)    
W Warren, MI