2025 GMC/Chevy Sierra/Silverado 1500 4" SST2.1 Premium Suspension System

Your Truck Deserves the Best—Not Just Another Lift Kit.  Upgrade your 2025 GMC Sierra or Chevy Silverado 1500 with the ultimate suspension system engineered to outperform and outlast the competition. ReadyLIFT’s all-new 4” SST2.1 Lift Kit doesn’t just raise your truck—it redefines what’s possible in ride quality, strength, and capability.

At the core of this industry-leading system are our all-new Falcon 2.1 Series front struts and rear shocks—a game-changer in suspension technology. Unlike standard lift kits that compromise ride quality, the Falcon Performance Shocks deliver unmatched comfort, control, handling, and design — whether you're cruising the highway, conquering the trails, or hauling serious weight.

Why Settle for Ordinary When You Can Have the Best?

·         Adjustable Suspension for Any Situation – Easily switch between Sport, Moderate Tow/Haul, and Heavy Tow/Haul with our 3-position Fast-Adjust Falcon 2.1 Shocks, ensuring your ride is optimized for whatever the road (or lack of it) throws at you.

·         More Strength, More Control – Built with heavy-duty DOM tubular steel upper control arms featuring high-angle proprietary ball joints, this kit provides superior articulation, enhanced durability, and extended component life—something generic lift kits just can’t match.

·         Larger Wheels, Bigger Presence – Say goodbye to restrictive stock setups. This lift kit opens up 295/65R20 (Chevy) and 295/55R20 (GMC & Chevy) tire fitments, giving your truck the aggressive stance and unstoppable ground clearance it was born to have.

·         Smart Suspension Technology – Unlike traditional cut-and-weld lift kits, our no-cut design preserves your factory ride characteristics while unlocking superior off-road capability and a bold new look.

This isn’t just an upgrade — it’s a transformation. Get the best in performance, durability, and versatility with ReadyLIFT’s 4” SST2.1 Suspension System. Don’t just lift your truck—elevate your driving experience. Get yours today and experience what true performance feels like.

Features and Benefits:

·         4” front lift with a 2.25” rear blocks. (Trail Boss and AT4 Rear Differ due to larger rear factory block)

·         Trail Boss and AT4 front heights over stock are 2"; the rear differ due to a larger rear factory block. 

·         20x9 0 offset 295/55-R20 - 2025 GMC & 2025 Chevy Max tire size

·         DOM tubular steel Upper Control Arms with market-best heavy-duty high-angle proprietary ball joint.

·         Unmatched curb-appeal and rugged mid-size truck capability delivered in an affordable yet innovative Smart Suspension Technology “no-cut” lift kit.

·         “High-Value Performance” is the driving force behind our new vehicle-specific Falcon shocks.

·         Falcon shock absorber systems are tuned for comfort with predictive handling, control, and stability on-road and offroad.  

·         Rear adjustable 3-position Falcon 2.1 shocks tune for daily, sport, or work duties.

·         Vehicle-specific performance-tuned Falcon 2.1 dampers on all four corners.

o   Improved dynamic roll control and low-speed damping.

o   Dramatic improvement in on-road comfort and off-road performance.

o   Optimized fitment for unobstructed suspension travel and articulation.

o   6061-T6 aluminum alloy shock body resists Impact to protect internal components.

o   Smooth-honed internal shock body surface for long-term performance.

o   3/4” induction hardened chrome plated shaft resists rock damage, corrosion, and shaft buckling.

o   Large shaft diameter provides a wide range of adjustments on adjustable shocks.

o   Hard anodized 6061-T6 aluminum alloy billet piston.

o   1-piece Teflon bronze piston wear band w/ O-ring.

Note: 

·         Use of Auto 4 Hi feature is not recommended.

·         Have not tested on ZR2 and AT4X.

·         Not compatible for 2019 classic body LD, Limited or Super Cruise. 

·         Single Cab configuration has not been validated for fitment & drivability by ReadyLIFT.  

·         Vehicles with Mono-leaf rear springs require 67-39530UB. Before ordering a ReadyLIFT GM1500 Lift Kit, please check the rear leaf spring for kit compatibility.

-  20x9 0 offset 295/55-R20 - 2025 GMC & 2025 Chevy Max tire size

Note: some trimming may be required depending on tire tread design.

AT4 - Max tire 305/55-20, 20x9 0 offset wheel

Trail Boss - Max tire 295/65-20, 20x9 0 offset wheel

Tire Size Note: ReadyLIFT wheel and tire fitment recommendations are typically based on Wheel Pros wheels and Nitto tires. Due to product differences among tire manufacturers, tire specifications and dimensions including, but limited to, overall diameter, rolling diameter, tread width, aspect ratio, lug pattern, sidewall construction and inflation pressure, will vary meaningfully by tire and wheel manufacturer. Every tire and wheel combination should be test fit prior to installation. Consult your local installer to learn more about the right tire fitment for your application.

Ride Quality Note: When lifting a vehicle and installing aftermarket wheels and tires, a tire manufacturer's construction and material quality can alter vehicle ride quality. When increasing a vehicle wheel and tire size, most larger aftermarket truck and SUV tires are 10-ply (or more) E tires compared to typical OEM 6-ply C tires. This more rigid sidewall construction increases the perception of suspension stiffness often described as ride harshness. The ride, handling, traction, noise, fuel economy, and wear differences between All-Season, All-Terrain, Mud-Terrain, or Trail-Terrain type tires can be significant. Please take into account tire and wheel choice will generally have a meaningful impact on the ride & handling experience.

2 IN Rear Bump Stop Extension

19-Current GM 1500, Coilover, Series 2 / Type 1, Single Finished/Front, 3" Lift 

19-Current GM 1500, Smooth Body, Series 3 / Type 2, Single Finished/ Rear, 3" Lift

UPPER CONTROL ARM KIT

2.25" Blocks

U-Bolts

Hardware Kit