Flex-Master 4-inch Lift Kit w/Bilstein 5100 Quad Shocks | 78-79 Ford Bronco SKU: 790007NET

Flex-Master 4-inch Suspension Lift Kit | Quad Shock | 1978–79 Ford Bronco

Give your 1978–79 Ford Bronco the suspension upgrade it was built for with our Flex-Master 4-inch Suspension Lift Kit for Quad Shock Setups. Designed specifically for Broncos originally equipped with the factory HD / Handling Package quad-shock setup, this kit delivers superior flex, strength, and ride quality for both daily driving and serious off-road use. Featuring Flex-Master progressive leaf springs, All Terrain coil springs, and a full set of six Bilstein 5100 shocks, this system brings your Bronco’s suspension performance to the next level while maintaining the correct factory-style shock layout.

Kit Includes

• Flex-Master 4" Leaf Springs (Pair) - 7-leaf progressive-rate springs with Berlin eyes, heavy-duty 7/16" center pins, and UHMW tip inserts for superior flex and longevity.

• All Terrain 4" Coil Springs (Pair) - Smooth, balanced ride quality for on-road stability and off-road control. Available in Red, Blue, or Black.

• Bilstein 5100 Series Shocks (Set of 6 – 4 Front, 2 Rear) - For factory quad-shock Broncos. Premium monotube performance with 46mm pistons and digressive valving for unmatched control.

• Heavy-Duty U-Bolt Kit with Plates - Ensures secure axle retention during extreme articulation.

• Polyurethane Spring & Shackle Bushings - Long-lasting, graphite-impregnated bushings for quiet operation and tighter suspension feel.

• Polyurethane Strut/Radius Arm Bushings - Improves ride stability and maintains proper caster under load.

• Polyurethane Trac Bar Bushing - Restores tight steering and reduces deflection.

• C-Bushings - Corrects caster geometry after lifting the front suspension.

• Shock Boots (Set of 6) - Protects all shock shafts and seals from dust, debris, and trail use.

Superior Flex & Articulation

Flex-Master rear springs paired with All Terrain coil springs deliver exceptionally smooth compression and controlled rebound, giving your Bronco real capability on uneven terrain while remaining comfortable on the street. The quad-shock front configuration enhances stability and damping control for larger tires and lifted suspension systems.

Includes All Six Bilstein 5100 Shocks

This Quad Shock Edition includes four front Bilstein 5100s for factory HD/Handling Package Broncos and two rear Bilstein 5100s. These monotube shocks are trusted by top Bronco builders for their durability, heat management, and unmatched ride control.

Urethane Bushings for Long Life

Graphite-impregnated urethane bushings throughout reduce noise, resist wear, and improve steering response—far superior to traditional rubber bushings in longevity and performance.

Custom Coil Spring Colors

Choose your look: Red, Blue, or Black All Terrain coils allow you to match your Bronco’s style or build theme.

Built for factory quad-shock 78-79 Ford Broncos, the Flex-Master 4" kit delivers superior flex, stability, and comfort with six Bilstein 5100 shocks included.