Its when the tyre is spinning then hooks up that causes the most shock load through the diff. Less it spins, the better it handles it. This is why we hardly have any dramas with the diesel autos out there, there ability to walk up obstacles in comparison to the manuals is awesome. Therefore, less breakage. Have a look at Chippis truck, the black Jk with the missing rear bushcracker, the ability for him (and I) to walk compared to the other trucks on the day was amazing.