Leaf Spring Perches 5 Inch Lift large Tube Bare Jeep XJ/MJ/YJ TNT Customs. Weld on leaf spring perches that do away with the damage prone U-bolts. The flatter the leaf spring in your Jeep, the better it will flex. Instead of running those high-arch springs, consider an alternative that has worked for us for years. TNT's U-Bolt Eliminator was designed to add a small amount of lift to your leaf spring vehicle while keeping everything above the differential tube. Doing so allows for an extremely clean install and a hang up free setup that will allow your suspension to work. If you want monster flex, you need to stick to as flat of a rear spring as possible. Excessive arch can work against you. Better results can be obtained for a 5.5 inch lift as follows: 3 1/2-inch leaves plus 1 1/2-inch shackles plus 1/2-inch leaf spring perches gives 5.5-inch net lift Features: Available in 1/2, 1 and 1 1/2 inch lift heights Will not spit out like a lift block Wide design helps eliminate wheel hop This product includes: 1 pair of leaf spring perches in chosen size 1 pair of top plates 1 pair of Universal High Clearance Stud Style Shock Mounts 1 hardware kit TNT High Clearance Shock Mounts move the shock mount up so that it is flush with the axle tube. Use of a shorter shock may be needed. Note: TNT U-Bolt Eliminators are recommended for use on rear axles only. Large tube: Ford 8.8, 9 inch, Dana 60, 14 bolt, JK D44 Small tube: Chr 8.25, D44 (non JK), D35