Stumped: Code on rear diff housing
Thread Starter
Racer
Joined: May 2002
Posts: 279
Likes: 0
From: Gig Harbor WA
Stumped: Code on rear diff housing
I'm pretty sure this is not original to my car and I'm not even sure it's from a Corvette. Any thoughts?
DA 209 W7E1 (the D may be an O, but I'm pretty sure it's a D)
Casting date is either G127 or G121
Thanks!
DA 209 W7E1 (the D may be an O, but I'm pretty sure it's a D)
Casting date is either G127 or G121
Thanks!
Team Owner
Joined: Oct 2000
Posts: 38,897
Likes: 1,926
From: Washington Michigan
There was never a "DA" Corvette axle code - it's probably "OA", which was only used twice - '76-'77 3.08 Posi, and '82 2.72 Posi. The '82 had the aluminum "batwing" diff, so that leaves the '76-'77 application for yours, and the G 12 7 casting date would be July 12, 1977.
The "209 W7 E1" says it was assembled on the 209th day of 1977 at Chevrolet-Warren, with an Eaton Posi unit, on first shift, which makes sense with the July 12th casting date.
The "209 W7 E1" says it was assembled on the 209th day of 1977 at Chevrolet-Warren, with an Eaton Posi unit, on first shift, which makes sense with the July 12th casting date.
Thread Starter
Racer
Joined: May 2002
Posts: 279
Likes: 0
From: Gig Harbor WA
Thanks for the reading. Looking at some of the books I have, I was confused, particularly by the 7 after the W. I had read somewhere that the manufacturing location code did not always follow the usual order after the gearing code. Might explain why this car with a NOM 396/375 is a little lazy??
Thanks again!!
Thanks again!!
Team Owner
Joined: Oct 2000
Posts: 38,897
Likes: 1,926
From: Washington Michigan
There were wide variations in C2-C3 diff ratio/date code stampings over the years, and not all of them follow the published format; some are dated using M/D/Y, some are M/D only, some are Julian-dated.
