This configuration includes FOX 2.5 Performance Elite rear shocks. These shocks feature a 2.5-inch impact extruded aluminum body, a massive 7/8-inch hard chrome plated heat-treated alloy steel shaft, an external reservoir design that separates shock oil from high-pressure nitrogen, a standard DSC (Dual Speed Compression) adjuster offering 10 separate low-speed and 12 high-speed compression levels, and are fully serviceable for a lifetime of use. Covered by a 1-year manufacturer's warranty.
Overview
This 4-inch suspension lift kit for the Chevy Trail Boss and GMC AT4 1500 (2019–2026) 4WD features FOX 2.5 Performance Elite coil-over shocks up front and provides clearance for up to 35-inch tires. The kit utilizes a high-clearance design to improve ground clearance, strength, and off-road protection while correcting suspension and steering geometry for on-road handling. Up front, the kit includes top-mounted strut spacers, upper control arms, high-arched 1/4-inch thick steel crossmembers, a multipiece differential relocation bracket system, and heavy duty skid plates. Steering geometry is corrected at the new ride height with CNC-machined ductile iron steering knuckles and replacement tie rod ends, maintaining ESC system compatibility. Sway bar drops, bump stop extensions, brake line brackets, CV spacers, and all necessary hardware are also included. In the rear, a heavy duty lift block replaces the stock block to lift and level the stance while retaining ride quality and load capacity, along with new U-bolts and brake line brackets.
Features
- FOX 2.5 Performance Elite series coil-overs with DSC Adjuster for improved ride quality, performance, and capability
- High clearance crossmember design maximizes ground clearance
- Robust CNC-machined ductile iron steering knuckles maintain ESC system compliance
- High-strength replacement upper control arms provide durability and serviceability
- HD skid plate system for improved off-road protection
- Multipoint differential relocation brackets to secure the front axle and improve CV angles
- Factory Protection Plus drivetrain warranty included
Specifications
- Lift Height: 4 inches
- Tire Clearance: Up to 35 inches
- Front shocks: FOX 2.5 Performance Elite coil-overs with DSC (Dual Speed Compression) Adjuster — 10 low-speed and 12 high-speed compression levels
- FOX 2.5 coil-over body: 2.5-inch impact extruded aluminum with external reservoir
- FOX 2.5 shaft: 7/8-inch hard chrome plated, heat-treated alloy steel
- Upper control arms: 1.5-inch OD x .120-wall tubular construction with indexed ball joint cup
- Upper control arm frame-end bushings: Durometer-specific rubber, maintenance-free
- Upper control arm ball joints: Greaseable, field-serviceable
- Upper control arm finish: Black powder coat with billet aluminum dust cap
- Crossmembers: 1/4-inch thick laser cut steel, high-clearance design
- Rear lift: Heavy duty lift block (replaces stock block)
- Rear hardware: New U-bolts and brake line brackets included
Installation
- Estimated Time: 8 hours
- Difficulty: Difficult
- Tools Required: 36mm Socket, Cut Off Wheel or Equivalent, Ball Joint Separation Tool, Reciprocating Saw, Welding Equipment
Important Notes
- Requires frame bracket modification.
- Factory 17–18-inch wheels cannot be reinstalled due to tie rod end interference; stock 20-inch wheels can be reinstalled.
- 17-inch wheels with 4.5-inch backspacing should be test fit prior to mounting the tire to ensure proper clearance to the steering knuckle and tie rod.
- All aftermarket wheels should be test fit prior to mounting the tire to ensure proper clearance to the brake caliper. Some wheel profiles will not clear the brake caliper. These can be test fitted before the vehicle is lifted in a stock condition.
- If equipped with a mono-leaf rear spring, please use part #UBT4064.
- 2.7L Turbo models must use the Diesel kit for proper skid plate fitment due to a clearance issue with the intercooler pipe.
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