I recently purchased a new 1/10 summit, and the rear differential moves inside the bulkhead. I searched the web, called traxxas, and looked at all exploded views no concrete solution found. The front differential does not move I do not want to tear it down if this is normal for this truck. I have checked the truck over well everything works fine, but u can see it move when the motor engages/slows down. If anyone has dealt with this problem I would love some advice/solution to the problem. Thanks