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I just purchased a 1996 f150 with a long box and am having trouble getting at the bed bolts under the frame as they seem to all be seized or stripped, any tips?
I had to cut off the side of the heads of some of my bed bolts and had a friend grip them with vise grips while i was under the truck removing the nuts. There are newer style bolts available that feature a clip-style nut that slots onto the frame in the 6 locations needed. The bolts themselves are giant button head allen's. The bolt/clip-nut kit is pretty cheap on amazon/ebay. They are marketed for newer trucks, but work just fine.
You can try cutting a slot in the top of the head with a small die grinder and cutting wheel. I used a Dremel. Worked good for two of the bolts but the last one I had to weld a nut on top of it. Should've done that first to save the hassle.