99-13 GM 1500/2500 4WD Add-A-Leaf

The 99-13 GM 1500/2500 4WD Add-A-Leaf from Skyjacker is a purpose-built suspension enhancement designed for trucks that demand improved load-carrying capacity and leveling. Whether you're hauling heavy payloads, towing trailers, or compensating for suspension sag from factory springs that have lost their original rate, this add-a-leaf kit restores ride height and distributes weight more evenly across the rear axle. Mechanics and truck owners choose this upgrade when stock springs compress under load or when additional spring stiffness is needed without a complete suspension overhaul.

This leaf spring insert works by adding a secondary leaf to your existing factory spring pack, increasing overall spring rate and load capacity while maintaining the truck's original suspension geometry. The design keeps your vehicle's handling characteristics predictable and preserves factory ride quality better than stacking blocks or installing a complete aftermarket spring system. Skyjacker's engineering ensures proper articulation and prevents the harsh, bottoming-out behavior common with improperly matched suspension modifications. The add-a-leaf approach is popular among 4WD enthusiasts because it's cost-effective, reversible, and requires minimal installation time compared to full-spring replacement kits.

This kit fits 1999–2013 GM full-size pickups in both 1500 and 2500 configurations, making it compatible with gasoline and diesel powertrains. Installation is straightforward for any mechanic with basic spring work experience—the leaf simply nests within the existing pack and is secured with factory bolts. Buyers typically install this upgrade after 80,000+ miles when factory springs show permanent sag, or immediately when planning to carry fifth-wheel trailers or frequent heavy loads. The 51.5-inch overall length ensures proper fit within the OEM spring perch, and the 24-pound weight matches Skyjacker's design specification for balanced suspension tuning.