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SumoSprings mount above your Ford F-53's rear axle and act as a progressive-rate cushion between the axle and frame. Unlike air springs, there's nothing to inflate, leak, or maintain - the closed-cell micro-cellular urethane simply compresses under load and rebounds to its original shape.
For F-53 chassis owners hauling passengers, gear, or towing near capacity, SumoSprings add a firmer, more controlled rear end without altering your factory ride height when unloaded.