Rusty's FSJ 3.5" - 4" Full Size Add-A-Leaf Lift Kit


  • Brand: Rusty's Off Road Products
  • Availability: In Stock
  • Part Number: RK-350AL-FS-RX1

This kit is the same kit as the Rusty's Spring Pack Kit but comes with full length add-a-leafs and lift blocks for the rear. This is a less expensive way to lift the rear of your vehicle.

Some suspension companies claim nothing has improved in the manufacturing of leaf spring in 25 years. Well not at Rusty's! While other companies continue to offer a 4 inch FSJ spring that was designed back in the 70's, many things have improved in the spring industry. Rusty's has incorporated many of these improvements in our FSJ springs, which are built in North America. The 4" lift front springs are constructed with four leafs that feature tapered leafs ends and anti-friction pads for a smooth ride. The leafs are shot-peened to further reduce stress and increase spring life. Only the best in rubber bushings are used, and the Rusty's front springs have a 310 lbs. spring rate. There is not a better spring pack built today.

In the rear, Rusty's uses high quality full-length add-a-leafs and 2.5 inch fabricated steel tapered blocks. The rear also includes new Grade 8 9/16" U-bolts.

To finish up kit, a complete set of Rusty's Hydro shocks are included. These shocks provide excellent on- and off-road performance along with the proper length to work with this complete system.

The saying "Often Copied, Never Duplicated" certainly applies to Rusty's FSJ kits. 3-D computer modeling and extensive development and testing were all used to create a suspension that was second to none. This suspension offers a great on road ride, extra load capacity, and great articulation. Make sure you don't accept anything less than Rusty's!


  • Best Quality Parts Built
  • Great Ride & Articulation
  • Complete Kit
  • Limited Lifetime Warranty

  • 2 - 3.5-4" Front Leaf Springs
  • 2 - Full Length Rear Add-A-Leafs
  • 2 - 2.5" Rear Fabricated Steel Lift Blocks
  • 8 - Grade 8 U-Bolts
  • Brake line Extension Brackets
  • 4 - Rusty's Hydro Shocks
  • Complete Instructions

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