TC3 diffs fit the SB V1 with a little bit of pursuation. (same as what the bj4 used)
I have found that replacing the screw, thrust race, and tnut with AE tc3 items has allowed me to tighten the diffs considerably. So much infact that grooves were worn into the steel plates by the balls. I've had academy screws break loooong before they reached this pressure.
I think that the weakness of the screw and soft steel plates don't allow the diff to be tightened fully.
All of this only applies to the SB V1, unless anybody knows if the cars are similarenough to have interchangeable parts.
Jon
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