44763 Tris count
you seriously expect this to work???
The model needs to be baked onto a lowpoly version, you cant expect something with this triscount to work properly in any engine.
i will do you the favour of running it thru zbrushs zremesher.
Update:
No use, you have way to many polys on the wheels and some other things are just bad.
I would suggest to use this version as a highpoly for baking the normals on a simple version.
http://j0linar.blogspot.co.at/