6 Inch Lift Kit - 56 Inch Rear Springs - Chevy/GMC C10/K10 Truck & SUV/K5 Blazer (77-87) - Rough Country - 21430

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 add-a-leaf's and brake line brackets maintain proper geometry ensuring a smooth factory-like ride after installation. For a complete suspension upgrade the kit is also available with replacement rear lifted leaf springs offering consistent rear lift and eliminating the need for lift blocks. 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 arm 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.
Boosted Ground Clearance: Gain the extra height needed for better off-road capability and obstacle clearance.
Application-Specific Front Leaf Springs: Engineered for a perfect fit and optimal ride quality.
Optional Rear Leaf Springs: Available with replacement rear springs for a complete suspension upgrade.
Clears 37-Inch Tires: Provides ample room to run up to a 37" tall tire with no rubbing.
Raised Steering Arm Included: Corrects steering geometry for precise handling and improved alignment.
Premium N3 Series Shocks: Includes application-valved N3 shock absorbers for balanced on-road comfort and off-road control.

Detailed Fitment Results
Year Make Model Sub Model Body Type Drive Type Position Fitment Notes 1977 GMC Jimmy Base / Sierra Classic / Sierra Grande / High Sierra 4WD "ONLY fits models with 56" rear leaf springs. If vehicle is equipped with a front sway-bar drop brackets are recommended SKU: 1019. Optional Rear Springs: To confirm rear spring size a measurement will have to be pulled from eyelet to eyelet. For a visual please click here. Vehicles with factory quad shocks (2 front shocks per side) will simply use a single aftermarket shock." 1977 GMC K15 Base / High Sierra / Sierra Classic / Sierra Grande / Indy Hauler 4WD "ONLY fits models with 56" rear leaf springs. If vehicle is equipped with a front sway-bar drop brackets are recommended SKU: 1019. Optional Rear Springs: To confirm rear spring size a measurement will have to be pulled from eyelet to eyelet. For a visual please click here. Vehicles with factory quad shocks (2 front shocks per side) will simply use a single aftermarket shock." 1977 GMC K15 Suburban Sierra Grande / Base / High Sierra / Sierra Classic 4WD "ONLY fits models with 56" rear leaf springs. If vehicle is equipped with a front sway-bar drop brackets are recommended SKU: 1019. Optional Rear Springs: To confirm rear spring size a measurement will have to be pulled from eyelet to eyelet. For a visual please click here. Vehicles with factory quad shocks (2 front shocks per side) will simply use a single aftermarket shock." 1977 Chevrolet K10 Scottsdale / Silverado / Cheyenne / Custom Deluxe 4WD "ONLY fits models with 56" rear leaf springs. If vehicle is equipped with a front sway-bar drop brackets are recommended SKU: 1019. Optional Rear Springs: To confirm rear spring size a measurement will have to be pulled from eyelet to eyelet. For a visual please click here. Vehicles with factory quad shocks (2 front shocks per side) will simply use a single aftermarket shock." 1977 Chevrolet K10 Suburban Custom Deluxe / Scottsdale / Silverado 4WD "ONLY fits models with 56" rear leaf springs. If vehicle is equipped with a front sway-bar drop brackets are recommended SKU: 1019. Optional Rear Springs: To confirm rear spring size a measurement will have to be pulled from eyelet to eyelet. For a visual please click here. Vehicles with factory quad shocks (2 front shocks per side) will simply use a single aftermarket shock." 1977 Chevrolet K5 Blazer Cheyenne / Custom Deluxe 4WD "ONLY fits models with 56" rear leaf springs. If vehicle is equipped with a front sway-bar drop brackets are recommended SKU: 1019. Optional Rear Springs: To confirm rear spring size a measurement will have to be pulled from eyelet to eyelet. For a visual please click here. Vehicles with factory quad shocks (2 front shocks per side) will simply use a single aftermarket shock." 1978 GMC Jimmy Base / Sierra Classic / Sierra Grande / High Sierra 4WD "ONLY fits models with 56" rear leaf springs. If vehicle is equipped with a front sway-bar drop brackets are recommended SKU: 1019. Optional Rear Springs: To confirm rear spring size a measurement will have to be pulled from eyelet to eyelet. For a visual please click here. Vehicles with factory quad shocks (2 front shocks per side) will simply use a single aftermarket shock." 1978 GMC K15 Base / High Sierra / Sierra Grande / Sierra Classic 4WD "ONLY fits models with 56" rear leaf springs. If vehicle is equipped with a front sway-bar drop brackets are recommended SKU: 1019. Optional Rear Springs: To confirm rear spring size a measurement will have to be pulled from eyelet to eyelet. For a visual please click here. Vehicles with factory quad shocks (2 front shocks per side) will simply use a si…