8 3/4 Thrust Block

If you are worried about proper bearing endplay then use green bearings. It elimantes adjusting the bearings all together. But just so that you know there good for strait line driving and not road racing.

I agree. Just use the greenies and forget about it. As far as them not being suitable for road racing, this may be true, but they are more than adequate for spirited street driving. So far, the rear end guru mentioned above, has sold me two sets knowing that they were going into street/strip applications.