2025-2026 GM 1500 4" Big Lift Kit (44-35400)

The ReadyLIFT 4/4.2-inch Big Lift Kit is engineered exclusively for the 2025 Chevy Silverado 1500 ZR2 and GMC Sierra 1500 AT4X trucks, designed to provide more ground clearance and enhanced off-roading capabilities while retaining the factory performance shocks (DSSV/Multimatic). Because these trucks come with a factory 2-inch lift, this 4-inch lift kit results in a total lift of 6 inches. Utilizing boxed steel cross members and a full-width front skid plate, the kit ensures superior performance with smooth rides over all terrain and maintains excellent ride quality.

Features

• Provides a total lift of 6 inches (4 inches from the kit plus the factory 2-inch lift).
• Maintains the factory ride quality and retains the factory DSSV/Multimatic performance shocks.
• Includes heavy-duty angled and offset top mount strut extensions that realign the struts to optimize shock performance.
• Features a proprietary lower strut clamshell design that maintains factory geometry and retains the use of the factory strut.
• Utilizes boxed steel front and rear cross members and a full-width front skid plate constructed of thick 3/16-inch plate steel.
• Comes with 1/4-inch boxed plate steel differential drop brackets designed to take the abuse of front differential torsional twisting.
• Includes new fabricated steel rear blocks with integrated bump stop landings and rear shock extensions.
• Backed by the ReadyGuard Powertrain Warranty.

Notes

• Use of the Auto 4 Hi feature is not recommended.
• Vehicle alignment and headlamp aim must be checked and adjusted after product installation.
• If the vehicle is equipped with Advanced Driver Assistance Systems (ADAS), these systems may require recalibration.
  

Compatibility Notes

• Engineered exclusively for 2025 Chevy Silverado 1500 ZR2 and GMC Sierra 1500 AT4X trucks.
• The kit is intended for use with factory upper control arms.
• Not compatible with rear composite mono-leaf springs.

Tire Fitment

• Recommended maximum tire with no trimming is 35x12.50 on a 20x9 wheel with 0 offset.
• With trimming, fitment is possible for up to 35x12.50 or 325/60R20 tires on a wheel with -18 offset.
• Trimming requirements include the front valance, front felt liner edge, rear felt liner edge, and front rear well edge mud flap.

Specs

• Lift Height: 4 inches (total 6 inches including factory lift).
  
• Cross Member Material: 3/16-inch plate steel.
  
• Differential Drop Material: 1/4-inch boxed plate steel.
  
• Kit Contents: Front/Rear Cross Members, Front Skid Plate, Lift Knuckles, Strut Extensions, Rear Shock Extensions, Differential Drop Brackets, Fabricated Rear Blocks, CV Axle Spacers, Brake Line Brackets, ABS Brackets, and installation hardware.