8. Next, it was time to install the new crossmember/differential mounting system. We looked at this part with a very critical eye until we were satisfied that it was strong enough to hold up to the abuse of our readers. Pro Comp did a great job of tying in the structural member so that forces from the lower A-arm pivot points would not affect the front drive system. The bracket itself is made from 3/8-inch-thick ductile steel sheet and features gussets and boxing to provide ample strength.