before you do that, if you havent started yet, let the wheels move in the air how they do while looking at the bottom of the truck, then i want you to stop the real wheels by putting pressure on they and see if the dogbone is still spinning or not. and lave the truck still giving throttle so we know if the dogbone has power in it by the front spinning. that would let us know that the problem is behind the dogbone or is near the tranny. but it should be behind it im assuming.