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Mine worked fine UNTIL I went to 95-97 dual piston front calipers... then I had to switch to a '86 F-250 MC (its all cast iron)I kept the spring perches on the bottom since my truck is 2wd. And lowered the front. I needed lift shackles on the back and used pinion shims. But I didn't have to change the proportioning valve my brakes work fine.