Timbren FR350SDE Rear SES Helper Spring Kit for 1970-2004 Ford F-350 Super Duty

Vehicle Fitment

• 1970-2004 Ford F-350 (2WD and 4WD Super Duty pickups; all trims including plow prep packs)

Fitment Notes

• Installed above rear leaf springs as helper springs
• Works with factory ride height; no lift required
• Engages only under load--does not affect unloaded ride comfort
• Not compatible with aftermarket airbag systems

Features

• Progressive-rate Aeon¬Æ rubber springs provide up to 8,600 lb load support
• Engages only when spring is compressed--maintains factory ride quality
• No maintenance required--no airlines or components that can leak
• Durable rubber springs and powder-coated steel brackets resist corrosion and fatigue
• Quick DIY bolt-on install in under 30 minutes using basic tools
• Built-in bump stops reduce suspension travel under heavy loads
• Zero customization needed--vehicle-specific fitment for F-350 Super Duty
• Backed by Lifetime Warranty and 100-day money-back guarantee

Specifications

• Part Number: FR350SDE
• Position: Rear helper springs (mounted above leaf springs)
• Rated Load Support: 8,600 lb
• Material: Aeon¬Æ rubber springs, powder-coated steel brackets
• Lifetime Warranty with 100-day satisfaction guarantee
• Approximate Install Time: 30 minutes

Included Components

• 2√ó Rubber springs (helper springs)
• 2√ó Powder-coated steel mounting brackets
• Hardware kit (bolts, nuts, washers)
• Installation instructions

Product Description

The Timbren FR350SDE Rear Suspension Enhancement System is engineered for 1970-2004 Ford F-350 Super Duty pickups (both 2WD and 4WD). Featuring durable Aeon® rubber springs that engage progressively under load, this kit adds up to 8,600 lb of support when towing or hauling without altering the factory ride when unloaded. Installation is simple and fast, requiring only basic hand tools and no modifications to the vehicle.

Designed to work with stock suspension, the kit mounts above the rear leaf springs and activates only when additional support is needed. It enhances stability, reduces trailer sway, and minimizes rear sag. With powder-coated brackets, corrosion-resistant rubber springs, and zero maintenance required, the FR350SDE offers a reliable and durable upgrade. It comes with Timbren’s industry-leading lifetime warranty and 100-day satisfaction guarantee, making it an excellent investment for those seeking improved towing peace of mind.