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The Superlift Super Duty 4-inch suspension kit consists of two new front springs, four Superide shocks with yellow boots, bumpstop extensions, longer front sway-bar links, and a Panhard-bar drop-down bracket (that's the big bracket in the middle). In the rear, you can choose between various height lift blocks (with U-bolts) or an add-a-leaf, depending on your Super Duty's jobs. We went with 2-inch lift blocks for a level truck with a light load.