so only the shoulders on the j bolts hold the axel bracket down? they just tighten upon the axel tube as the leaf spring wraps up? I guess as long as you trust the welds on your brackets to axel tube. I saw a back axel come loose in a 68 Camaro, it took out the floor, back seat, driveshaft, and fuel tank, gas everywhere. lucky no fire. I like real U-bolts now.