When I changed the shocks I had the car on the lift and dropped the swinging arm low enough to remove the bolts from the shocks. Hanging down so low the belt was under tension but not extremely. So the pivot point is very close to the centre line of the box.
But to my opinion the belt tension will not bring the solution for our bevel box problem. If the solution would be so easy it would be solved already for long. Most of the boxes which having problems getting more noisy when hot and I don't see what this has to do with the belt tension.
