posts are good.

those huge heavy looking sub frames are really not all that thick. they get their strength from the shape. they really arent designed to jack the car up with. if you look in the owners manual you will not find that they recommend using them to jack the car up.

i do it all the time too though. i do use a board too. you will note that your failure is at the weld. the heat generated there makes it a little more prone to rusting.

if you make a pattern of cardboard that folds around the subframe tightly about 12 to 16 inches long you could apply it over the affected area and secure it with self tapping sheet metal screws every two or three inches. stay away from the corner of your subframe as that is where the stress is greatest. apply liberal amounts of roofing cement under and around the edges. this will be simple, wont require welding and will last as long as you want to drive the car.

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.