Originally Posted by symmetricon

My advice to you, since I had the same problem, disengage the motor pinion from the spur gear, take the belt, slipper and clicker off. Take the rires off. Now check the top shaft of the front and rear, iff there is any binding, back out all 3 of the screws that screw into the motor plate and the front 4x4 belt cover. I would back out each screw 1/4 turn untill there is no binding when rotationg the top shaft. Once you get the ront and rear smooth, put the belt on( im using hole 3 in the rear and 5 in the front). It should be smooth with no binding. Put your wheels on and roll it across the floor, it should roll nice and smooth. Mesh up you pinion and spur gear and your ready to roll!