Carli XXHD Leaf Spring Kits are designed for trucks with constant 3,500 pounds in the bed – cab-over campers, fully ladened work trucks, hardcore overland builds, etc. These leaf spring packs are NOT designed to run unloaded!. As with Carli XHD springs, these will have a custom-order lead time AND require custom tuned Pintop Shocks (different tuning than the XHD shocks) to support the massive spring rates and load capacity of these springs.. Carli Xxhd Leaf Spring Kit - 2017-23 Ford F250/F350 - +3500 Lbs - 1in Lift. Block-eliminating, full progressive spring pack produces 1-inch lift. Fits 2017-23 Ford F250/F350 4×4, diesel, w/ 3.5-4.0″ axle tube. Carli XXHD Full Replacement Leaf Springs, 2017-23 Ford F250/F350. Includes new U-bolts and rear bump stop drops. Requires the 3,500-pound constant load. Allows use of 37-inch tire. CS-FFSP-LVL-17-XXHD. XXHD leaf springs

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