You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join Corvetteforum.com today!
I got this years back when my uncle passed and can't figure this thing out.It is some kind of mutt.Casting # is 3789812 which i think is 62-64 only.However the casting date is K16 Nov.1 1966 i think.Scrubbed to look for the code but does't seem to have been stamped on the opposite side.Doesn't look to be posi anymore Ring gear is 3733908 9-37 4 69 for date and pinion 3733912 9-37 and 3 69 for date.So my question is could these all be over the counter parts? Should there be a code stamped still if they were.I know they were hard to see sometimes but I don't think this one got one.Any thoughts of what it might be worth as I think sooner or later I will sell it.Any help would be appreciated Thanks
If someone wants to see pictures I can email them I don't have enough skills to do them here
Yes, that is a service part, both the posi case and the ring & pinion gears.
The 812 cases were the LAST version, which was used during VERY LATE 61-64 production (VERY LATE 61-62 Vettes and -64 pass cars). Since there are no pictures, I can't tell if it has a posi or non-posi differential. The gears are 4.11------------------not a big demand for those anymore. If it does not have a posi unit, then the ONLY thing of significant value is the P case-------------------and that's not worth a whole lot since it was made AFTER regular production as a service part. For just a posi case, it has a fair value, but for the person looking for a correct dated case, 64 was the last time it was used on a production car (62 for Vettes).
If the P case was sold over the counter as just a bare case, then there would NOT be any stamped code on the pass side.