I am restoring a high performance 1964 Chevrolet Nova Super Sport. I built a 488 horsepower ( on a chassis dyno ) 383 cubic inch V-8, manual valve body turbo 350 transmission and a 12 bolt positraction rear axle with 4:56 ratio rear gears. The car has fiberglass front fenders, hood and trunk deck and weighs just over a ton. My question is... can I use a MIG welder to re-attach the leaf spring supports back onto the rear axle tubes ? It seams after a few hard take-offs I snapped my rear universal, broke two of four 5/8 inch u-bolts and the rear axle spun 90 degrees. I replaced the driveshaft with a heavy duty unit and now need to do something to keep the axle from spinning. Any suggestions ?