8 3/4 3.55 Sure Grip Diff.

I'll post up some more pic of the gear teeth if that helps. I DID say in the ad that it whines... So maybe the gears are bad. I'm not a ring and pinion expert. I do know that I have gone 12.60's in the 1/4 and put several thousand miles on my car with that diff in it. So the gears aren't too trashed.