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We’re more concerned about suspension flex and ride comfort (relative) than load-carrying capacity, so we went with Tuff Country tapered 5 1/4-inch lift blocks and retained the factory Ford leaf springs. Kelly Davis at Tuff Country tells us that his company is the only one to offer 3-inch-wide blocks to correctly match the axle pads and springs on Super Duty trucks. We used a Tuff Country add-a-leaf in an attempt to combat axlewrap.