Flex-Master Leaf Springs | 4-inch Lift | 78-96 Ford Bronco, 73-96 F150 SKU: 791140

Flex-Master 4-inch Lift Rear Leaf Springs | 78–96 Bronco & 73–96 F150

These Flex-Master 4-inch lift rear leaf springs were designed from the ground up to deliver the perfect balance of strength, flexibility, and real-world function for full-size Broncos and F150 4WDs. Whether you're building for the trail or just want a better ride with added lift, this 7-pack, progressive rate spring set gets the job done with features serious wheelers will appreciate.

Each spring features Berlin eyes on both ends and a double wrap front eye for added safety and durability. We upped the center pin size to 7/16"—a serious upgrade over the factory 3/8" pin—to handle modern wheeling stress. To reduce friction and noise, UHMW polyethylene tip inserts are integrated into each leaf. For easy installation, they’re built with a flat spring pad surface to ensure proper contact with your axle perch.

• Fitment: 1978–96 Ford Bronco & 1973–96 Ford F150 4WD

• Lift Height: 4 inches

• Spring Pack: 7 leafs per spring

• Strength Features:

  • Berlin eyes on both ends for durability

  • 7/16" center pin for improved strength (minor clearancing required on spring wedge)

• Flex Features:

  • Progressive rate design for controlled articulation and ride quality

  • UHMW polyethylene inserts reduce friction and improve smoothness

• Safety & Fitment Features:

  • Double wrap front eye for added security

  • Flat spring pad mounting surface for clean, preload-free install

  • Riveted bolt clips help prevent axle wrap and keep spring alignment tight

Our 4" Flex-Master rear leafs give your 78-96 Bronco or 73-96 F150 the clearance, articulation and strength off-roaders demand without sacrificing ride quality.