Just an fyi:
Last time I has my xb4 apart due to what I thought were transmission problems, I found that the motor was touching off on the plastic chassis tub either due to motor plate or chassis flex. The rear bearing in the motor was toast. I shaved the plastic tub in that area to give the motor plenty of clearance, so hopefully all should be fine now.
Check it when you can! It could cost you a motor.
Last edited by annonymous; 02-08-2013 at 03:05 PM.