1967 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 font of right axle tube either adjacent to the carrier housing or about 8" - 10" inboard from the backing plates.

Example: CB1012W decodes to CB ~ 3.36:1, 1025 ~ Month [Oct] and Day [12], W ~ Warren (B=Buffalo, G=Chevrolet Gear & Axle, K=McKinnon Industries). See bottom of page for photo examples.

Casting Numbers:
12-Bolt Casting #N3894939 (narrow early model year), #NF3917124 (wide late model year)*
10-Bolt Casting #3894938N

* (Note: For what it's worth, ALL 67 rear ends I've ever seen were the narrow variety and used the spring cup like 68-72 but were narrower like the 64-66. I do have photos of a June 1967 cast #3917124 rear end but the assembly date is October - obviously for a 1968 model year Chevelle. However, a June 1967 casting date rear end such as this might have found its way into very late 1967 model year Chevelles as well and could be the basis for the statement in an article from Car Craft magazine some years ago titled "Inside 64-72 A-Bodies".)

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

The gear ratio code, date, and rear axle assembly plant are generally stamped into the right (passenger side) axle housing facing forward and exact locations may vary slightly. This is an example from a 1967 Chevelle and is stamped CB 1012 W.  The "CB" letters are the original ID code for a 3.36:1 ratio, 1012 is the assembly date of October 12, and the "W" indicates the plant code for Warren, MI. This identification may not always be stamped clearly and the area is often covered with years of road grime so it may take some scrubbing to reveal it.

CB ~ 3.36:1, October 12, Warren

CZ ~ 2.73:1, December 21, Buffalo

KW ~ Positraction 2.73:1, April 18

KO ~ 4.88:1, September 28, 1966 - Courtesy Jeff Helms

Casting Date Examples

Casting date example of F 21 7 for June 21, 1967

Casting date example of L 14 7 for December 14, 1967

Casting Number Examples

1967-1969 ~ Variations of casting number 3917124

Want more in-depth information on 1966/1967 Chevelles? Try my 1966/1967 Chevelle Reference CD.