Rough Country 249.20 — 6 Inch Lift Kit | Rear Springs | Chevy/GMC K30/K35 Truck 4WD (77-87).

About this part

Transform Your Truck's Stance and Capability: Upgrade your GM truck from front to back with Rough Country's 6" Suspension Lift Kit. This premium lift delivers a leveled, aggressive look while enhancing ride height and off-road readiness all with an easy bolt-on installation. Engineered for Superior Ride Quality: This kit includes application-specific front lifted leaf springs, delivering increased ground clearance without sacrificing ride comfort or control. Rear lift blocks, rear leaf springs, and brake line brackets maintain proper geometry, ensuring a smooth, factory-like ride after installation. Enhanced Performance with N3 Series Shocks: Rough Country's N3 series shocks come standard valved for your exact application and designed to provide a perfect balance of on-road smoothness and off-road capability. Featuring a 10-stage variable valving system, high-pressure nitrogen charge, and durable 54mm shock body with 18mm piston rod, these shocks are built for performance and longevity. Room for Bigger Tires: Make room for aggressive wheel and tire combos. This 6" lift offers enough clearance to run up to a 37" tall tire with proper backspacing, giving your truck the rugged stance it deserves. Improved Steering and Handling: To maintain proper drivability, a raised steering block is included correcting steering geometry for tight, responsive handling after the lift. Limited Lifetime Warranty: Rough Country backs this kit with a Limited Lifetime Warranty, giving you long-term confidence on and off the road.

Manufacturer features

Boosted Ground Clearance: Gain the extra height needed for better off-road capability and obstacle clearance. Application-Specific Front & Rear Leaf Springs: Engineered for a perfect fit and optimal ride quality. Raised Steering Block Included: Corrects steering geometry for precise handling and improved alignment. Clears 37-Inch Tires: Provides ample room to run up to a 37" tall tire with no rubbing. Premium N3 Series Shocks: Includes application-valved N3 shock absorbers for balanced on-road comfort and off-road control.

Front kit contents

Lifted Leaf Springs Steering Block Brake Line Relocation Brackets U-Bolts Hardware

Rear kit contents

Lifted Leaf Springs 2" Lift Blocks U-Bolts Hardware

Important application and installation requirements

Due to variances in axle sizing, this kit does NOT fit dually models.

Manufacturer installation time estimate

6 - 8 hours

Manufacturer-listed applications

1977-1987:4WD:Chevy:C30/K30 Pickup;1977-1987:4WD:GMC:C35/K35 Pickup;1988-1991:4WD:Chevy:C3500/K3500 Pickup;1988-1991:4WD:GMC:C3500/K3500 Pickup

Read the complete trim, drivetrain and installation restrictions. Application records are manufacturer supplied; they are not an independent fitment certification.

Manufacturer part number: 249.20. Shipping weight: 296.30lbs. Supplier shipping classification: Ground Only.

Rough Country product specifications and restrictions

Compare products and plan your setup

Compare Suspension Lift Kits from the existing category · More from Rough Country

Find manufacturer-listed Rough Country applications. Check each part’s requirements before combining products.