Someone had mentioned before that adding the 50t spur you the losi did not need any gear mesh adjustment and that the spur did not stick out the bottom of the chassis. However, i got 2 of them in today and the tip of the teeth (about 1mm) stick out the bottom of the chassis and i did have to move the gear mesh. I will be making a spacer to go under the center diff mounts so the center spurr is not sticking out the bottom of the chassis.