BDS 1834FPE 3 inch FOX 2.5 Elite Coilover Lift Kit | 2020-2025 GM 2500HD/3500HD 6.6L Duramax

Features:

• 3-inch front suspension lift
• FOX 2.5 Performance Elite coilovers
• Includes FOX 2.5 rear shocks
• Remote reservoirs for better heat control
• DSC adjusters for compression tuning
• Replaces factory torsion bar setup
• Heavy-duty upper control arms included
• Boxed and gusseted lower control arms
• Improves travel and off-road capability
• Corrects suspension and steering alignment
• Clears up to 35-inch tires
• 100% bolt-on, no cutting required

Upgrade Your Ride Without Sacrificing What Matters

If you're going to lift your truck, you might as well do it with something that feels as good as it looks. With the BDS 1834FPE 3-inch Coilover Lift Kit, you won't have to sacrifice comfort or control! This system delivers a noticeable improvement in how your Duramax handles, both on the road and off it. Up front, the FOX 2.5 Performance Elite coilovers give you a smoother ride, real adjustability, and more travel, thanks to their remote reservoirs and dual speed compression adjusters. It’s the kind of setup that makes a difference whether you're rolling through daily commutes or pushing hard on backcountry trails. The matching FOX 2.5 rear shocks round out the system without requiring a rear block, making it ideal for trucks that don’t run factory overload springs. You also get clearance for 35-inch tires, tighter handling, and a more confident stance—all in a kit that installs cleanly and performs right out of the box. If you're after ride quality and capability without unnecessary complexity, this kit checks every box.

Complete Suspension System Tuned for Heavy Duty Performance

The BDS 1834FPE kit is designed specifically for 2020–2025 GM 2500HD and 3500HD Duramax trucks that are not equipped with rear overload springs. At the core of the system are FOX 2.5 Performance Elite coilovers, which completely replace the stock torsion bars for improved front-end travel, articulation, and overall ride quality. These coilovers feature dual speed compression (DSC) adjusters and remote reservoirs to manage damping at both low and high speeds, providing consistent control over changing terrain. The included upper control arms are TIG-welded from 1.5-inch OD tubing for strength and proper ball joint alignment, while the lower arms are fully boxed and gusseted to handle high-stress use. Differential relocation brackets correct CV angles and help maintain drivetrain geometry after the lift. In the rear, FOX 2.5 Performance Elite shocks provide balanced damping without the need for block spacers, delivering a smoother ride and improved load response. This is a precision-engineered system that upgrades suspension function across the board—on-road or off.

Fits: 2020, 2021, 2022, 2023, 2024, 2025 GM 2500HD/3500HD 6.6L Duramax

Note:

• Models with two-piece rear drive shafts require a carrier bearing drop kit (BDS121612)
• Requires frame bracket modification and minor welding
• Factory torsion bar system requires a special unloading tool
• GM specified tool number is CH48809
• Compatible with diesel models only, including standard and AT4
• Not recommended for gas models due to excessive lift
• Available preload adjustment may not achieve desired ride height on gas models
• Minor trimming may be required with certain wheel and tire combinations
• Trimming typically includes inner fender shrouds and bumper valance corners
• Deeper backspacing and narrower tires reduce or eliminate trimming
• Dually models require aftermarket 20" wheels with max 285/60/20 tires
• Factory 17", 18", and 20" wheels cannot be reused due to control arm clearance
• Coilover spring has high preload and requires a spring compressor for removal
• Failure to use a spring compressor may result in serious injury or death
• Do not increase coilover preload
• Use service kit BDS081203 for replacement ball joints
• Ball joints must be installed with the dot facing inward or outward
• Track width increases 1" per side (2" overall) to improve suspension travel and clearance

Wheel and Tire Fitment:

• 35 x 12.50 on 17" x 9" with 4.5 to 5.5" backspacing**
• 285/75 on 17" x 9" with 4.5 to 5.5" backspacing*
• 35 x 12.50 on 18" x 9" with 4.5 to 5.5" backspacing**
• 285/70 on 18" x 9" with 4.5 to 5.5" backspacing*
• 35 x 12.50 on 20" x 9" with 4.5 to 5.5" backspacing**
• 295/60 on 20" x 9" with 4.5 to 5.5" backspacing*
• For wheels larger than 20", use 20" wheel specs
• **Trimming is required
• *Trimming may be required
• Stock 17", 18", and 20" wheels will not fit after installation

Install Instructions