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So my vehicule's wheels spins and turn, but the whole thing doesn't move help ?

I tried to replicate this tutorial : https://www.youtube.com/watch?v=9ariPx6M33o&list=PLZlv_N0_O1gaz6eETtIxcmUDnqu5A-8At∈dex=1

When i use the car provided it work fine, but when i use my own mesh the car doesn’t move. The wheels spin and rotate but the car stand still. I have no idea why, i don’t understand whats the problem with my mesh. here is the fbx https://mega.co.nz/#!SY9SVQgY!W4WCYwUqP6zmbArP0PHHgbmtDH7tL8bhkN-KGCO9Wes

Someone can help me ?