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 | | |
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