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Ford Suspension

Before the axle went in, the guys opened the U-bolt holes toward the outside of each pair of holes 1/8 inch to accommodate the '57's wider spring. This is one of the few holdover parts that works for '53-60 trucks, but it provides an inch less drop on '57-60 trucks due to their slightly dropped axle from the factory compared to pre-'56 F-100s.
Don't Pick Your Nose, Slam It! - Ford Drop Kit

 Before the axle went in, the guys opened the U-bolt holes toward the outside of each pair of holes 1/8 inch to accommodate the '57's wider spring. This is one of the few holdover parts that works for '53-60 trucks, but it provides an inch less drop on '57-60 trucks due to their slightly dropped axle from the factory compared to pre-'56 F-100s.  View Related Article

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