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

Configured with FOX 2.0 Performance Series rear shocks featuring a 2-inch impact extruded aluminum body, internal floating piston (IFP) monotube design, CNC machined 6061-T6 aluminum mounting ends, a massive 5/8-inch hard chrome plated heat-treated alloy steel shaft, race-developed high-flow piston design, application-specific valving for maximized performance, and a long-lasting clear anodized finish.

Overview

This 4-inch suspension lift kit from BDS Suspension is designed for the Chevy Trail Boss and GMC AT4 1500 (2020–2026) 4WD Diesel trucks, improving stance, performance, and capability with clearance for up to 35-inch tires. The kit utilizes a high-clearance design for improved ground clearance, strength, and off-road protection while correcting suspension and steering geometry for proper 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, and heavy duty skid plates. CNC-machined ductile iron steering knuckles and replacement tie rod ends correct steering geometry at the new ride height while maintaining ESC system compatibility. Additional front components include sway bar drops, bump stop extensions, brake line brackets, CV spacers, and all necessary hardware.

In the rear, a heavy duty lift block installs in place of the stock block, retaining ride quality and load capacity. Also included are new U-bolts, brake line brackets, and precision-tuned rear shocks.

Features

• High clearance crossmember design maximizes ground clearance
• Robust 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
• Upper Control Arm Tubing: 1.5-inch OD x .120-wall tubular construction
• Upper Control Arm Finish: Durable black powder coat with billet aluminum dust cap
• Upper Control Arm Bushings: Durometer-specific rubber bushings (frame end); greaseable ball joint (knuckle end)
• Crossmember Thickness: 1/4-inch thick laser cut steel
• Steering Knuckles: CNC-machined ductile cast iron
• Rear Block: 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-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.
• 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.
• 2.7L Turbo models use the Diesel kit for proper skid plate fitment.
• If equipped with a mono-leaf rear spring, please use part #UBT4064.