I’m having some similar problems. Thanks to the advice mentioned earlier, I was able to fix a majority of the problems I’ve been having. However when I run a test of my vehicle, the camera jumps forward, and it would appear that the entire front end of my vehicle collapses. Plus when I try to move forward my wheels spin around my vehicle. I think some of the issues I mentioned can be solved with baking the pivot point, which I could not figure out how to do in Maya 2015.
Here is a screenshot of what I am talking about, hope it helps:
