ReadyLift 44-39420 4" Big Lift Kit

The ReadyLift 44-39420 4" Big Lift Kit allows you to mount up to 35” tires on your GM Silverado/Sierra 1500 2WD/4WD. The front & rear cross members and full-width front skid plate in this lift kit are constructed with 3/16” boxed steel plate. The differential drop brackets have a twin gusseted center rib 1/4 plate steel with a boxed center rib to handle the torsional twisting of the front differential.

This Big Lift Kit optimizes shock performance and reduces wear thanks to the heavy-duty angled and offset top mount strut extensions that realign the struts. A specially engineered lower mount strut pre-load spacer increases spring rate to better manage the bigger tires that will find their way onto your truck. The rear is lifted using fabricated steel rear blocks with integrated bump stop landings have been included along with rear shock extensions.

Max tire with no trimming:  20x9 0 offset and 35x12.50 tires.

Max with trimming: 20x10 -18 offset - 35x12.50 or 325/60R20 - Trimming requirements for larger than recommended wheel/tire include front valance, front felt liner edge, rear felt liner edge and front rear well edge mud flap.

Use of the Auto 4 Hi feature is not recommended.

Only compatible with Adaptive Ride Control suspension vehicles.

Diesel applications may require a small modification to the transmission line bracket. 

This kit is not compatible with vehicles equipped with rear composite mono-leaf springs. 

This lift kit will require the ReadyLift 67-35150UB U-Bolt Kit to fit late model 2024 or 2025 applications that have round U-bolts.(See Add-Ons)