fauxrs

Does anybody have the codes for the rear gear on a 78 vette - I have my diff out and just want to verify the contents - I could also count the teeth on the ring and pinion I know, but it always good to know another bit of info.

Paul L

OK-3.08:1
OM-3.36:1
OH-3.55:1
OJ-3.70:1

fauxrs

Thanks - that was quick - can always rely on the forum :cheers:

Paul L

No problem. Let us know if things are "correct."

fauxrs

Well I finally went back into my garage to look at the codes on the diff case.
The main reason i asked this question was that any codes on te bottom were difficult to read but it sure looked as iff there was 355 stamped on the bottom of the case. Well I would have been bummed if it turned out i had 3.55 gears instead of the 3.70 i thought i had. I still think there is something odd about whats on the bottom of the case 'cause it sure dont look like the codes above, in truth i really just cant read it.

instead i spun the ring gear around until i found the gm part number and the 37/10 notation (ring/pinion) which equate to the 3.70 that i expected to have in an l-82.

alls well that ends well

Stingy74

fauxrs

yup thats the number 3961419

DP77Vette

Would these be the same fo a '77? If not please help me out?

Thanks a bunch!! :cheers:

Captain Morgan

Where in the world are these codes stamped??? I have looked countless times and cannot find them. The only thing I found was an OJ written in yellow grease pencil on the diff support cross-member (yes, the car has that few miles on it that it is still noticeable). While I do know what gears I have, it just bugs the crap out of me that I can't find the number stamped on the diff.

BTW, I have also seen literature that states the rear was 3.73, not 3.70. Any ideas as to why? Not that the .03 would make much difference, but I'm curious as to why there would be an inconsistency in the lit that is out there.

78Vette-SA

The numbers are stamped (although sometimes not very deeply) into the bottom of the diff on the lower part of the housing. If you look up from the bottom (after removing the heat shield) it should be right in front of the lip where the pumpkin (cover) bolts on.

fauxrs

actually I'm wondering how you can get a 3.73 ratio out of whole numbers if the ratio is determined by ring gear/pinion gear - what combo gives 3.73?

Captain Morgan

Anybody know anything more about the rear gears? 3.70 or 3.73?

ylose

I am pretty sure the 3.70 (and the other 'vette only gears, 3.08,3.55,3.70,3.90,etc) needs a different carrier guys than the normal GM with the 3.73 due to the mount or the half-shaft setups we run in the vettes.....our carrier is 'special'....


[Modified by ylose, 10:22 AM 1/28/2002]