2025 GM 1500 ZR2 AT4X 6" Big Lift Kit (44-35600)

The ReadyLIFT 6-inch Big Lift Kit for the 2025 Chevy Silverado ZR2 and GMC Sierra AT4X is a high-performance suspension system designed for aggressive off-roading and a commanding stance. Engineered with heavy-duty boxed steel crossmembers and thick 3/16-inch plate steel skid plates, this kit delivers extreme ground clearance and structural rigidity. It utilizes a proprietary lower strut clamshell design to maintain factory geometry, ensuring that your truck retains its smooth, quiet ride while gaining the clearance needed for massive 37-inch tires.

Features

• Provides a total of 8 inches of lift (ReadyLIFT 6-inch + Factory 2-inch lift).
• Heavy-duty angled and offset top mount strut extensions optimize shock performance and minimize wear.
• Proprietary lower strut clamshell design maintains factory suspension geometry.
• Constructed with boxed steel front/rear crossmembers and a full-width 3/16-inch plate steel front skid plate.
• Differential drop brackets feature 1/4-inch boxed plate steel with double gussets for torsional strength.
• Includes tube steel upper control arms with maintenance-free pivot bushings and 1-ton ball joints.
• Fabricated 5-inch tall tapered rear lift blocks with integrated bump stop landings maintain proper rake.
• Includes a rear add-a-leaf kit and shock extensions to retain the use of factory performance shocks.

Notes

• The use of the "Auto 4 Hi" feature is not recommended after installation.
• Not compatible with vehicles equipped with rear mono-leaf springs.
• Trimming of the front valance and fender liners is required for larger than recommended tire/wheel combinations.
• A vehicle alignment and calibration of Advanced Driver Assistance Systems (ADAS) are necessary after installation.

Compatibility Notes

• Exclusively engineered for the 2025 Chevy Silverado 1500 ZR2 and GMC Sierra 1500 AT4X 4WD.
• Retains the high-performance factory Multimatic DSSV dampers.
• Will not fit 2025 models with round U-bolts without the use of part number 67-35150UB.

Tire Fitment

• Recommended (No Trimming): 37x12.50 tires on 20x9 wheels with 0 offset.
• Maximum Fitment (With Trimming): 37x12.50 tires on 20x10 wheels with -18 offset.

Specs

• Total Lift Height: 8 inches.
• Crossmember/Skid Plate Material: 3/16-inch thick plate steel.
• Differential Drop Material: 1/4-inch boxed plate steel.
• Kit Contents: Ductile iron knuckles, front/rear crossmembers, skid plate, differential drops, strut extensions, pre-load spacers, tubular UCAs, rear blocks, add-a-leaf kit, and rear shock extensions.