that is a box frame ? if not you can use a big adjustable wrench to bend the frame if it is a C chanle frame rail. or make a wrench. by cutting a slot the thickness of the frame rail in some 1/2 flat plate or welding a jaw on some old [] tubbing.then you will have a lever to push or pull the frame lip. i have had to do this on GM frames were someone lifted them were not boxs