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


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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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Returns Policy

Please read the policy below to familiarize yourself with how we operate.

Please verify the part number that you are ordering before you place your order. If a part is ordered incorrectly by the customer and then returned, the customer will be responsible for all shipping charges and will be subject to a 20% restocking fee. We cannot be held responsible for manufacturer misinformation. If we messed up the order, then of course, we will take care of it. An RGA number must be requested within 7 days of receipt of the product by the customer. Returns must be received within 30 days of the initial purchase. After 30 days we do not accept returns. If an RGA is requested after 7 days of receiving the product then only an in-store credit will be issued. We do not refund shipping costs.

  • All returns require an RGA (Return Goods Authorization) number. Please email:, to obtain this number. Please allow 24-48 hours for a response during busy times.
  • The RGA number must be marked on a label outside of the returned box. Do not write on the retail packaging or it will void the return.
  • All returned goods must be sent freight prepaid by the customer.
  • A 20% restocking fee will be applied to all returned goods.
  • All returned merchandise will be inspected before credit is applied to the account.
  • All items that receive credit will need to be in NEW, UNUSED, and resellable condition including original packaging with all components. The product cannot be altered, damaged or missing pieces.
  • If you refuse deliveries from shipping carriers, this will result in penalty charges. The shipping return cost(s) will be deducted from your refund amount.
  • If the item is a warranty issue, please contact the manufacturer for warranty.
  • Warranty issues will not be refunded after 30 days. Warranties are handled through manufacturers.
  • Please understand that damage in shipping is the shippers fault not ours. We simply ship it to you. If you do receive a damaged package, we must follow the procedure indicated by the carrier. Please contact the carrier first prior to contacting JeepHut. If you do not have time to wait, we can process another order for you and refund after the shipping claim has been approved.
  • Any scratch and dent, surplus, overstock, garage sale, used products, and eBay auction merchandise will not be refunded. All merchandise is sold “AS IS” and all sales are final. A description of each item will be posted. The best description possible will be given.
  • No returns on custom or fabrication work including paint, custom design, modification and fabrication of parts
  • No returns are accepted on special orders, factory dropships, and body parts.
  • No returns on electrical or Audio (No Exceptions), Issues must be handled with manufacturer under warranty.
  • Locker and Gear returns must be received with full inspection showing no use, installation or wear. All parts and packaging must be in new unused and undamaged condition.
  • Tires or wheels once mounted are not accepted for returns. Only factory replacement if defective under the manufacturer's warranty with their approval can be provided.


  • We guarantee a timely shipping process.
  • We reserve the right to adjust shipping prices before we ship any order. You will be contacted before we charge you any different than the price quoted during your order and be given the opportunity to cancel the order.
  • We currently Only ship within the continental United States (Alaska and Hawaii are not included). If you would like shipping to other areas of the world please email and we can get you a quote.
  • Orders cannot be shipped to PO boxes. We must have a physical address to ship merchandise to.
  • Express shipping is available for an additional charge. You must contact us at 706-692-5488 prior to placing an order.
  • All orders are shipped by ground delivery unless otherwise specified.
  • JeepHut is not responsible for freight damages. Please inspect merchandise before signing for. All claims must be made with the shipping carrier. We will not refund payment due to freight damages.
  • Shipping charges on scratch and dent, surplus, overstock, used products, ebay store and auction products are different from drop shipping charges. Bumpers and large items require different shipping charges that what are listed below.
  • We reserve the right to adjust shipping prices before we ship any order. You will be contacted before we charge you any different than the price quoted during your order and be given the opportunity to cancel the order.
  • Order Cancellation:
  • If you cancel an order you must call 706-692-5488 and receive a order cancellation number. Do not email as emails may not be received. If you do not have a order cancellation number then do not assume a order is canceled and you will be responsible for returning the product once it has shipped. We appreciate your business and try to make your order as seamless as possible

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