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Leaf Spring Mount

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Leaf springs mount on the axle at the spring pad or perch, and a pin in the leaf pack centers the spring like this spring-under design. In a spring-over design the leaf pack is on top of the axle. Both are secured to the axle by U-bolts or bolts. Most replacement leaf packs will bolt right in, but you have to be careful as some applications use spacers or shims between the axle and the spring, and on some front applications left and right leaf springs are used.