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Because of the variation of factory rear lifts, the Pro Comp kit uses a 1-inch block in conjunction with the stock block and add-a-leaf, depending on what is needed. A replacement leaf pack will soon be available, which is good since we frown on slacking blocks. However, you’ll have to front the extra money for the option. Slip the new U-bolts over the axletube along their mounts and torque the U-bolt nuts to 115 lb-ft. The brake lines may become taut and need a little more stretch. Using pliers, bend the brake line bracket towards you about 90 degrees.
Titantic Tech for Super Duties

 Because of the variation of factory rear lifts, the Pro Comp kit uses a 1-inch block in conjunction with the stock block and add-a-leaf, depending on what is needed. A replacement leaf pack will soon be available, which is good since we frown on slacking blocks. However, you’ll have to front the extra money for the option. Slip the new U-bolts over the axletube along their mounts and torque the U-bolt nuts to 115 lb-ft. The brake lines may become taut and need a little more stretch. Using pliers, bend the brake line bracket towards you about 90 degrees.  View Related Article