Sure grip 7 1/4 strenght?

with a small 7 1/4" ring gear, you have a very small pinion gear, and teeny tiny little end gears (the ones that the axles fit into, and the ones that rotate inside the carrier) the smaller the gear, the weaker it is

We have a winner. Not only the weaker, but the FASTER those little weenie gears spin and the more heat they build up.