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The spring towers employ upper spring seats with threaded adjuster sleeves, allowing you to fine-tune ride height up to 2-1/2 inches after the suspension is assembled. The sleeves are installed from the bottom of the spring tower and should initially be adjusted to their midpoint. Threaded bosses allow installation of grease zerks and set screws so the sleeves can be lubricated and properly secured. This optional wrench (PN 910-34613), available for purchase separately, is highly recommended for adjusting the sleeves after assembly.