Hellwig LP-25 progressive-rate helper spring for 2011–2018 GMC 2500/3500 pickups and cab & chassis provides up to 2,500 lbs of level load capacity for single rear-wheel multi-leaf applications. These Load Pro springs are intended for heavy-duty and fleet use. Installation requires the appropriate LP mounting kit sold separately. They offer tunable load control, easy installation and are covered by Hellwig's limited lifetime warranty.
Hellwig 11-18 GMC 2500/3500 Load Pro - Up To 2500lb Level LC 3 Leaf Helper Spring w/o Mounting Kit