[suicideneil]

How were you planning to fit these in a revo- do you have some of Mikes Hybrid diff cases?

How many shims depends on how tight or loose they feel once dry-assembled- usually you do it by feel since every diff has tiny variances.

Diff fluid weights tend t be the same or very similar from brand to brand- for 1/8 scale diffs something around 5k front & 3k rear, or 7k front & 3 or 5k rear is fairly typical ( I use 5k/3k for my UE diffs in my Gmaxx ).