BDS 3 Inch FOX Coilover Conversion Lift Kit | Chevy Silverado/GMC Sierra 2500HD/3500HD Diesel 4WD (2011-2019) | Block Kit w/ Factory Overload | FOX 2.5 Performance Elite Rear Shocks

Rear Lift Option: Includes a rear block lift kit for trucks with factory top-mounted overload springs on the rear leaf springs. Installs in place of the stock block, retaining ride quality and load capacity, with a U-bolt flip kit for maximum clearance.

Rear Shock Option: Includes FOX 2.5 Performance Elite rear shocks — 2.5-inch impact extruded aluminum body, 7/8-inch hard chrome plated heat-treated alloy steel shaft, external reservoir, DSC (Dual Speed Compression) adjuster, and fully serviceable design. 1-year manufacturer's warranty.

Overview

This 3-inch FOX 2.5 Performance Elite Coilover Conversion kit is designed for 2011–2019 Chevy Silverado/GMC Sierra 2500/3500 HD diesel trucks (4WD) and includes everything necessary to convert the factory torsion bar front suspension to a coilover setup, with clearance for up to 35-inch tires. Up front, the kit utilizes FOX 2.5 Performance Elite coilover shocks, heavy-duty tubular upper control arms, fully boxed and gusseted lower control arms, and multipiece differential relocation brackets to maintain correct CV angles, along with sway bar links and all required hardware. In the rear, the kit includes options for replacement lift blocks to lift and level the stance — installing in place of the stock block to retain ride quality and load capacity — along with a U-bolt flip kit for maximum clearance and a choice of FOX rear shocks. This kit is engineered to improve ground clearance, strength, and off-road protection while correcting suspension and steering geometry for on-road handling.

Features

• Converts factory torsion bar front suspension to a coilover for improved ride comfort
• Includes BDS fabricated upper and lower control arms
• FOX 2.5 Performance Elite series DSC coilovers offer improved damper performance over stock
• BDS performance UCAs increase strength and allow for more suspension travel
• Factory Protection Plus drivetrain warranty included
• Optional FOX 2.0 Performance Series or FOX 2.5 Performance Elite rear shocks available

FOX 2.5 Performance Elite Coilovers

FOX Performance Elite 2.5 coilovers are bolt-on units built for abuse and packed with race-proven technology. They include a remote reservoir for additional fluid capacity to help keep shocks running cool in rough terrain. DSC (Dual Speed Compression) adjustment comes standard, allowing tuning of both high-speed and low-speed compression damping for on-road control and off-road performance. Adjustment is made via two clearly defined knobs for immediate feedback.

• 2.5-inch impact extruded aluminum body
• Massive 7/8-inch hard chrome plated heat-treated alloy steel shaft
• External reservoir separates shock oil from high-pressure nitrogen
• DSC — Dual Speed Compression Adjuster standard
• Fully serviceable for a lifetime of use
• 1-year Manufacturer's Warranty

HD Control Arms

Upper control arms are fabricated from 1.5-inch OD x .120-wall tubing, fully TIG welded, with an indexed ball joint cup to correct ball joint positioning for additional down travel and camber adjustment. Lower control arms are built from high-strength steel, fully boxed and internally gusseted. Frame mounting ends use durometer-specific rubber bushings for maintenance-free operation; the opposite ends feature greaseable ball joints for smooth, quiet operation and durability. Arms are finished in durable black powder coat with a billet aluminum dust cap.

FOX 2.0 Performance Series Rear Shocks (where selected)

• 2-inch impact extruded aluminum body
• Internal floating piston (IFP) monotube design
• CNC machined 6061-T6 aluminum mounting ends
• Large 5/8-inch hard chrome plated heat-treated alloy steel shaft
• Race-developed high-flow piston design
• Application-specific valving to maximize performance
• Long-lasting clear anodized finish
• 1-year Manufacturer's Warranty

Specifications

• Lift Height: 3 inches (front coilover conversion)
• Fits: 2011–2019 Chevy Silverado / GMC Sierra 2500HD / 3500HD — Diesel, 4WD
• Upper control arm tubing: 1.5-inch OD x .120-wall, fully TIG welded
• Lower control arms: high-strength steel, fully boxed and internally gusseted
• Coilover diameter: 2.5 inches (FOX Performance Elite)
• Maximum tire clearance: up to 35-inch tires
• Rear lift blocks install in place of stock block; U-bolt flip kit included with block kit options

Installation

• Estimated Time: 9.5 hours
• Difficulty: Difficult
• Note: Requires minor welding

Important Notes

• Factory 17-inch, 18-inch, and 20-inch wheels cannot be reinstalled. See instructions for detailed wheel/tire fitment notes.
• Minor metal trimming may be required with 35x12.50R20 on 20x9 with 5–5.5-inch backspacing.
• Requires minor welding.
• Coilovers are preset for DIESEL engine models. Use on GAS engine models is not recommended due to providing too much lift. Available preload adjustment is typically not enough to achieve desired ride height on gas models.
• Dually models will require aftermarket 20-inch wheels with a maximum tire size of 285/60/20.
• Select the correct Rear Lift Option based on whether your truck was manufactured with or without top-mounted overload springs on the rear leaf springs.