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RF spring perch rusted in half and lowered the truck quite nicely. Only on one side though. looked at some 77 f150's and they look the same. Will they fit?, or does it have to be 65-66?
61-72 is your best bet for a direct bolt in. 73-79 moved the perches 2in wider on each side. Your springs are 2 1/4 wide 73-79 are 2 1/2 wide.
65-72 Twin I-beam have a 4 in wider track on the front than the rear. In 73 the rear axle width was increased 4in to even the track. The 73+ will work, but you have to have the perches cut off and moved in, the shocks mounts too.
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