Well after 1 hour 30, the car is reassembled and it was indeed the problem !

Ps : The left wheel doesn't turn at the same speed as the right wheel when dragging it on the rear wheels or moving the spur gear manually.
Is it something I should be concerned about?

Thanks you so much for the help guys !

Im curious how you got it together backward... Everything lined up nicely?

Yes everything worked fine when pressing the trigger and the pieces lined up, I guess it's pretty easy to mess up if you don't know.

It should turn the same speed as the other wheels. Maybe you got a bad bearing or something binding that left wheel.

I will look into that !!

Thanks again

traxxas bearing rust out and bind up easy.

noted !! thanks !!

Try Checking Your Slipper Clutch It Might Be To Lose