Originally Posted by
monkeyracing
Swapped out the motor plate, same deal. Haven't tried the stock diff. I suppose that would be smart.
We've all dealt with this over the years by leaving the screws backed out half a turn. This is just a bit more bind than I'm used to seeing. Stuck a tiny shim in each spot and it loosened up nicely.
Just break out the calliper and measure the two diffs. That should illuminate either way.
Leaving screws loose is just a half arsed band aid that will shift the problem elsewhere.
It is also possible that the plastic allows the screws to bite deeper and pinch the chassis tighter with use. However, this is just conjecture until you measure the diffs (and perhaps chase other gremlins as well).