My rigged car imported problem

I want the 3dmax car that i have created and rigged to be exported and do the same in unreal engine but the problem is that when i export my skeletal mesh and my physics assets from the same car in unreal engine the bone(dummies) that i have used just breaks offhttps://drive.google.com/open?id=0B3rVyctpbHYNc1JBUUJWWWFwdjg …you will understand it better if you try it yourself if have both 3d max and unreal engine…Please i need your help

Please provide images.

Also when exporting meshes from 3dmax to unreal I recommend that you do not attach any bones onto the mesh (completely remove the rig). Unreal engine understands how to handle a wheeled vehicle mesh and if you are new to unreal I would not recommend trying to rig a vehicle because it will lead to various problems that you will not be able to solve on your own.