BDS 1812FPE 3 inch FOX 2.0 Coilover Lift Kit | 2020-2025 GM 2500HD/3500HD 6.6L Duramax w/ Rear Overload

Features:

• 3-inch lift for 2020–2025 GM HD trucks
• Front FOX 2.5 Elite coil-overs with DSC adjusters
• Dual-speed compression for on/off-road tuning
• Remote reservoirs keep shocks cool under load
• FOX 2.0 rear shocks for balanced performance
• Converts torsion bar suspension to coil-overs
• Heavy-duty upper and lower control arms included
• Fully boxed lower arms for added strength
• Clearance for up to 35-inch tires
• 100% bolt-on installation, no cutting needed
• Maintains ride quality and load capacity
• Built for serious off-road and towing use

Coilover Conversion Lift Kit with FOX 2.0 Rear Shocks

If you're looking to give your 2020–2025 GM 2500HD or 3500HD Duramax a performance-driven lift that doesn’t sacrifice ride quality, the BDS 1812FPE 3-Inch Coilover Lift Kit is a killer option—especially for trucks equipped with factory rear overload springs. This kit ditches the factory torsion bar setup in favor of a true coilover design, replacing it with a set of FOX 2.5 Performance Elite coil-overs up front and FOX 2.0 shocks out back. The result? A suspension that not only looks the part but seriously upgrades your truck’s capability and comfort both on and off the pavement. Let’s talk about the shocks. The front FOX 2.5 Performance Elite coil-overs are the star of the show. They feature race-proven tech like remote reservoirs for cooler operation and DSC (dual speed compression) adjusters that let you fine-tune both high- and low-speed damping. Whether you're cruising down the highway or hammering through rough terrain, you can dial them in to match your driving style. Out back, the kit includes FOX 2.0 Performance Series rear shocks. While not as adjustable as the 2.5s, they still offer excellent control and a much smoother ride over stock, especially for everyday driving, towing, and moderate off-roading. If you're not planning to push your truck to the limit every weekend, the 2.0s are more than capable—and they help keep the overall cost in check.

Includes Rear Block Kit for Trucks with Rear Overload Springs

For the rear of the truck, this version of the kit includes a specially designed lift block that’s built to work with the factory overload spring setup. It gives you the height needed to match the front while preserving ride quality and maintaining payload capacity. If you’re comparing this to the version of the kit that omits rear blocks, it really comes down to your truck’s factory configuration. The no-block option is ideal if you've already handled the rear with aftermarket springs or airbags. But if you're running the factory leaf and overload combo, this kit ensures everything stays level and functional, right out of the box. Whether you're lifting for looks, clearance, or capability, this setup gives you a solid, well-rounded solution without cutting corners.

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

Application Notes:

• Models with two-piece rear drive shafts will require a carrier bearing drop kit (BDS121612)
• Requires frame bracket modification and minor welding
• Disassembly/assembly of the factory torsion bar system requires the use of a special unloading tool
• The GM specified tool # is CH48809
• Compatible with diesel models ONLY—standard and AT4 models
• Not recommended for gas models due to excessive lift
• Minor trimming required with certain wheel/tire setups
• Dually models require aftermarket 20" wheels with 285/60/20 tires
• Factory 17", 18", and 20" wheels cannot be reused
• Coil spring compressor required for coil removal—use with caution
• Do NOT increase coilover preload
• Use BDS081203 for replacement ball joints—install with “dot” facing in or out
• Track width increases by 1" per side for added travel clearance

Wheel and Tire Fitment Notes:

• 35 x 12.50 on 17" x 9" w/ 4.5–5.5" backspacing**
• 285/75 on 17" x 9" w/ 4.5–5.5" backspacing*
• 35 x 12.50 on 18" x 9" w/ 4.5–5.5" backspacing**
• 285/70 on 18" x 9" w/ 4.5–5.5" backspacing*
• 35 x 12.50 on 20" x 9" w/ 4.5–5.5" backspacing**
• 295/60 on 20" x 9" w/ 4.5–5.5" backspacing*
• 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