You can brace it like a tank and it will NOT fix the inherent weakness of the 8.75. Torque pushes the ring gear away from the pinion when the case flexes. You CAN'T fix that. They break caps because all the debris from the shelled teeth gets in there and it pushes the cap off. So you will spend a lot of time and money trying to fix a problem you can't fix and it will eventually break anyway.

Put a 9" inch in it and forget it