BDS 4 Inch Lift Kit | FOX 2.5 Performance Elite Coil-Over | Chevy Trail Boss & GMC AT4 1500 (2020-2026) 4WD Diesel | w/ FOX 2.0 Performance Series Rear Shocks

This variant includes FOX 2.0 Performance Series rear shocks. The 2.0-inch impact extruded aluminum body features an internal floating piston (IFP) monotube design, a large 5/8-inch hard chrome plated heat-treated alloy steel shaft, CNC machined 6061-T6 aluminum mounting ends, race-developed high-flow piston design, and application-specific valving. Finished with a clear anodized coating for long-lasting durability. Covered by a 1-year manufacturer's warranty.

Overview

This 4-inch suspension lift kit for the Chevy Trail Boss and GMC AT4 1500 (2020–2026) 4WD Diesel features FOX 2.5 Performance Elite coil-over shocks up front and provides clearance for up to 35-inch tires. The kit employs 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 utilizes 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 supplied hardware complete the front suspension system. 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, accompanied by new U-bolts, brake line brackets, and rear shocks (variant-dependent).

Features

• FOX 2.5 Performance Elite series coilovers 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 remote reservoir and DSC adjuster (10 low-speed / 12 high-speed compression levels)
• FOX 2.5 coil-over body: 2.5-inch impact extruded aluminum with 7/8-inch hard chrome plated heat-treated alloy steel shaft
• Crossmembers: 1/4-inch thick laser cut steel, high-clearance design
• Upper Control Arms: 1.5-inch OD x .120-wall tubular construction with indexed ball joint cup, greaseable ball joints, and durometer-specific rubber frame bushings
• UCA Finish: Durable black powder coat with billet aluminum dust cap
• Rear: Heavy-duty lift block with new U-bolts and brake line brackets
• Rear Shock Option: FOX 2.0 Performance Series or FOX 2.5 Performance Elite (see variant selection)

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-inch and 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.
• Front skid plate will not work with 2.7L Turbo engines.
• If equipped with a mono-leaf rear spring, please use part #UBT4064.
• 2.7L Turbo models should use the Diesel kit for proper skid plate fitment.