The higher the gear the faster you need to push to get the relevant engine speed , also the more mechanical advantage you get if large engine with high compression . If you go to low gear eg 1st or reverse the more inertia you need to build up to vercome the geared resistance of the engine , and therefore the more strain you will put on the bits connecting the engine to the wheels . LR halfshafts were at one time tested to survive a quantity of roll backs with clutch being engaged sharply , you will be basically repeating this type of test so guess the end result ?