ProComp 11-19 GM HD 4WD 6″ COMPLETE KIT

The ProComp GM HD 4WD 6 Inch Complete Lift Kit 2011-2019 GM 2500HD and 3500HD 4WD owners who want a true 6-inch stance, room for larger tires, and a complete lift system that addresses the unique geometry requirements of the GM HD IFS torsion bar front suspension without compromising daily drivability, steering feel, or driveline integrity. From high-strength extended steering knuckles and heavy-duty one-piece crossmembers to front differential drop brackets, torsion bar drop hardware, and tuned rear monotube shocks, this Pro Comp system is engineered as a complete matched package rather than a collection of generic components. 

At IMM Hawaii Parts, we carry this kit for GM HD owners who want a properly built 6-inch lift that handles the specific engineering demands of the IFS torsion bar platform correctly.

ProComp GM HD 4WD 6 Inch Complete Lift Kit 2011-2019 With Extended Steering Knuckles

The high-strength extended steering knuckles in this kit maintain proper factory steering geometry after 6 inches of lift is added to the GM 2500HD and 3500HD IFS front suspension. On the GM HD IFS platform, adding significant lift height without correcting the knuckle geometry creates compromised steering angles, poor front-end feel, and accelerated wear on ball joints and CV joints that operate outside their designed range. 

The extended knuckles in this Pro Comp system keep the front suspension geometry within a functional and safe operating range at 6 inches of lift, preserving the steering feel and front suspension capability that GM HD owners depend on for work use and towing stability. Customers at IMM Hawaii Parts who have installed basic spacer lifts on their GM HD and experienced these issues understand why proper knuckle geometry is essential on a 6-inch lift for this platform.

Heavy Duty One-Piece Front and Rear Crossmembers for Chassis Rigidity

The one-piece front and rear crossmembers in this system are fabricated as heavy-duty structural components that add rigidity to the chassis mounting points affected by the 6-inch lift on the GM HD platform. Heavy-duty trucks like the 2500HD and 3500HD place enormous stress on crossmember components during maximum tow and payload use, and the one-piece design of these crossmembers distributes that stress more effectively than multi-piece alternatives. The crossmembers also provide the mounting foundation for the differential drop and sway bar corrections needed at this lift height, ensuring all geometry changes are addressed through a unified and properly engineered structure.

Front Differential Drop Brackets and Torsion Bar Drop Hardware

The front differential drop brackets in this kit are essential for maintaining correct CV operating angles after the 6-inch lift is installed on the GM HD 4WD IFS platform. Steep CV angles created by significant front lift without a differential drop lead to accelerated CV wear, driveline vibration, and reduced front driveshaft life on a heavy-duty truck that regularly operates under load. The torsion bar drop hardware addresses the specific requirements of the GM HD IFS torsion bar front suspension design, ensuring the torsion bars are correctly positioned and loaded at the 6-inch lift height rather than operating at compromised angles that would affect ride quality and alignment stability.

Complete Rear Lift With Blocks, Add-A-Leaf, and Tuned Monotube Shocks

The rear of this system delivers a 6-inch lift through vehicle-specific rear lift blocks and/or add-a-leaf components as required for the specific GM HD configuration, with heavy-duty U-bolts included for a secure and properly supported rear axle installation. Tuned rear monotube shocks provide composed and controlled damping for both on-road daily driving and weekend trail use on the lifted GM HD, with the monotube design ensuring consistent performance through the full range of rear suspension travel. Sway bar, brake line, and bump stop solutions are also included to complete the rear suspension geometry correction and ensure proper travel throughout the lift range.

Supports Work Use and Weekend Trail Performance

This 6-inch lift system is engineered to maintain the work capability and daily drivability that GM HD owners depend on while adding the stance and clearance needed for more aggressive off-road use. The purpose-built components correct CV and steering angles specifically for the GM HD IFS torsion bar platform, which is more geometrically complex than a coil spring front suspension and requires more precise engineering to lift correctly. Professional alignment is recommended after installation to confirm proper caster, camber, and toe settings with the new knuckle geometry and lift height in place.

Important Compatibility Notes

This lift kit is designed for 2011 through 2019 GM 2500HD and 3500HD 4WD trucks. Always confirm your specific GM HD trim, drivetrain, and suspension configuration before ordering. Professional alignment is strongly recommended after installation.

Product Details

Why This System Is Built for GM HD Work Trucks

The ProComp GM HD 4WD 6 Inch Complete Lift Kit 2011-2019 GM 2500HD and 3500HD 4WD owners who want a complete and properly engineered 6-inch lift system designed specifically for the IFS torsion bar platform. With extended steering knuckles, differential drop brackets, one-piece crossmembers, and tuned rear monotube shocks all included, this kit delivers the stance, clearance, and geometry correction that serious GM HD builds require. Shop this kit and complete GM HD wheel and tire packages at IMM Hawaii Parts, where our team can help you build the perfect 6-inch lifted HD truck setup for work, towing, and trail use.

Whether you're planning an off-road build or replacing worn components, contact IMM Hawaii Parts for expert advice and quality products.