Really doubt that you have anything in traction aids in the differentials. As an older driver, I would say to you to not to continuously 'dump' the clutch. The reaction within the drivetrain is a shock to the system. The engine spinning against the friction of the tires on the ground. Something in between will either bend or break. Think of it like someone pulling on your arm. If you are relaxed, it could pull out of the shoulder if the pull was hard enough. If you are prepared, you could pull a muscle or pop a joint.
Reason you are seeing 2 marks from the axle is because the reaction is jolting the drivetrain. Both tires loose enough traction and spin. A much better way of determining if you have traction aids is to lift a tire in the air on the rear axle. Use a floor jack or the vehicles jack, with trans in neutral and 1 tire in the air (parking brake off), spin the tire and see if you can. If you can, there is no aid. The ds should also spin.
