Description
ReadyLift’s 4″ Big Lift Kit for the 2019-2024 Chevy Silverado Trail Boss and GMC Sierra AT4 1500 is purpose-engineered for these factory-lifted platforms — a critical distinction, as standard 4″ kits are not compatible with the Trail Boss/AT4 factory suspension lift. Features 3/16″ boxed steel plate front and rear cross members with a full-width skid plate, heavy-duty angled offset top mount strut extensions, 1/4″ boxed plate differential drop brackets, and fabricated steel rear lift blocks with rear shock extensions. Tested to improve ride quality over stock in the lifted configuration. Not compatible with rear mono-leaf springs. Single cab not validated. Note: 2024-2025 trucks with round U-bolts require separate 67-35150UB U-bolt kit.
Fits: 2019-2024 Chevy Silverado 1500 Trail Boss / 2019-2024 GMC Sierra 1500 AT4 (not standard 1500). Not for diesel. Not compatible with rear mono-leaf springs.
Lift: 4″ front / matched rear
Max tire size: 35×12.50 on 20×9 0 offset (no trim required)
Includes: All front lift components, cross members, skid plate, diff drop brackets, strut extensions, rear lift blocks, rear shock extensions, and all installation hardware.
Part Number: 44-39420 | Lifetime Structural / 1 Year Wearable Warranty
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