1964 Chevelle Rear Axle Identification

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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.

Example: YB 1025 decodes to YB ~ 3.36:1, 1025 ~ Month [Oct] and Day [25]

Casting Numbers:
10-Bolt Casting #3839390N

The casting numbers/letters on rear end housings may have either a prefix or suffix of "N" or "NF" and no reason has been found yet why they may have one or the other.

Assembly Day - 3rd and 4th numbers
01...31

ZA 1001 ~ 3.08:1 - October 1

ZA ~ 3.08:1 ~ June 23

Casting Date Examples

Casting date example of H 20 4 for August 20, 1964

Housing Casting