I did 2"x3" .120wall connectors. I welded the fronts to plates, then to the trans x-member, the backs got sliced and folded up to meet the stubs of the rear frame. There wasn't a lot sticking out in front of the 72 h-code (340 stick) demon torque boxes. Mine are not welded to the floor at all, mostly b/c I already did a full interior w dynamat and didnt want to do it all over again. Like everybody said, night and day handling, squeaks, rattles gone.