ReadyLIFT delivers a performance game changer for the popular 2011-2019 Chevy Silverado and GMC Sierra 2500/3500 HD trucks with the release of our new 5”-6” MAX2.1 Suspension 2.1 Falcon shocks. Designed to improve stance performance and capability this kit includes everything necessary to clear larger wheels and tires. With vehicle-specific performance-tuned Falcon 2.1 dampers on all four corners of our 5”-6” kits these lift kits provide a better-than-factory feel.  Falcon Performance Shocks improve performance and comfort regardless of the terrain. The versatility of these systems makes them ideal for daily driving off-road excursions and tow/haul duties.The 42-31540 5”-6” MAX2.1 system includes laser-cut fabricated heavy-duty steel cross-members new cast iron OE-style knuckles with the perfect geometry built-in torsion arm brackets taller cast style rear lift blocks new forged torsion keys with the proper amount of indexing. These new torsion bar relocation brackets eliminate the traditional lowering of the torsion bars which can inhibit ground clearance and help to improve the overall driving experience. Additionally each kit includes crucial differential drop brackets and CV axle spacers sway bar end links bump stop extensions OE style cast rear lift blocks heavy-duty steel skid plate and finally Falcon shocks.; Features:- Vehicle-specific performance-tuned Falcon 2.1 monotube dampers on all four corners.- Improved dynamic roll control and low-speed damping.- Dramatic improvement in on-road comfort and off-road performance.- Optimized fitment for unobstructed suspension travel and articulation.- 6061-T6 aluminum alloy shock body resists Impact to protect internal components.- Smooth-honed internal shock body surface for long-term performance.- 3/4” induction hardened chrome plated shaft resists rock damage corrosion and shaft buckling.- Large shaft diameter provides a wide range of adjustments on adjustable shocks.- Hard anodized 6061-T6 aluminum alloy billet piston.- 1-piece Teflon bronze piston wear band w/ O-ring.- Heavy-duty fabricated steel components utilizing 3/16? and 1/4? steel plate- Full-coverage differential skid plate constructed from 3/16? steel plate- Laser cut CNC formed heavy-duty front/rear drop crossmembers.- 5”-6” lift allows up to 35x12.50 with a 20×9” with 0 offsetNOTE: Some SRW (Single Rear Wheel) models may require custom U-Bolts to accommodate the factory tow package. Will not fit DRW (Dual Rear Wheel) applications without custom U-bolts. Towing Capacity will be reduced with the installation of this kit. This kit is primarily designed to only be driven in 2WD at speed on public roads and that 4WD is only to be used off-road or in adverse slow speed conditions due to drive line vibrations at high speeds. A double cardan driveshaft may be required to help eliminate some of the high-speed 4WD front driveline vibrations when kits are 5-8'' high.