Superlift K171F 6-Inch 4-Link Suspension Lift Kit with FOX 2.0 Series Shocks

The Superlift K171F is a complete 6-inch 4-Link coil spring suspension lift kit engineered for 2017–2022 Ford F-250 and F-350 Super Duty 4WD diesel trucks. Designed using original equipment (OE) CAD data, this kit delivers a significant lift while maintaining OEM caster and camber alignment specs for a confident, road-worthy result.

Heavy-Duty Tubular 4-Link Arms

At the core of this kit are Superlift's precision-engineered, heavy-duty tubular 4-Link arms fabricated from DOM steel tubing with CNC-formed steel plate and professional hand welding. Each arm uses a press-fit REFLEX bushing for superior vibration dampening, flexibility, and long-term durability. The 4-Link geometry limits caster change throughout the suspension cycle, optimizing tire wear and overall handling control.

FOX Performance Series 2.0 IFP Shocks

This K171F variant includes FOX Performance Series 2.0 IFP shocks for both front and rear. Each shock features a 5/8-inch hard chrome plated, heat-treated alloy steel shaft paired with a 2-inch diameter CNC-machined 6061-T6 aluminum shock body for excellent heat dissipation. The Internal Floating Piston (IFP) mono-tube design separates the JM92 shock oil from a high-pressure nitrogen-charged gas chamber, eliminating oil aeration for consistent, maximum performance on and off road. Shocks are finished in a durable clear-anodized coating.

What's Included:

• Diesel-specific rate front coil lift springs
• Heavy-duty tubular 4-Link arms with REFLEX press-fit bushings
• Drop pitman arm
• Track bar relocation bracket for proper steering geometry
• Sway bar correction and brake line brackets
• Steering stabilizer bracket
• Fabricated rear lift blocks with U-bolts (replaces stock block)
• Front and rear FOX Performance Series 2.0 IFP shocks
• All required installation hardware
• Detailed step-by-step instruction manual

Key Specs & Notes:

• Lift Height: 6 inches
• Tire Clearance: Up to 40 x 13.5 on 20-inch wheels
• Designed using OE CAD data for precise fitment
• Retains OEM caster and camber alignment specifications
• Rear fabricated blocks allow proper pinion/axle angle and reduce axle wrap
• Backed by Superlift's limited lifetime warranty

Note: Trucks equipped with a 2-piece rear driveshaft require a carrier bearing spacer (Part #9669). Trucks with factory top-mount overload leaf springs require longer U-bolts (Part #11734).