RAS RoadActive Suspension 3611-YHD Rear Helper Spring for Ford F150 4WD (2009–2025) — Heavy-Duty, Maintains Ride Height

RAS RoadActive Suspension 3611-YHD is a direct-fit heavy-duty rear leaf spring upgrade for Ford F150 4WD (2009–2025) that reduces rear squat and bounce while preserving normal ride height.

This RoadActive Suspension (RAS) 3611-YHD unit is the original heavy-duty rear helper spring developed by the creators of the RoadActive system in North Carolina. Built for durability and engineered to strengthen the stock leaf springs by up to 50%, it improves load support, towing control, and traction without the trade-offs of airbags or rigid jounce-style components. Installation is straightforward, requires no maintenance, and the upgrade begins working immediately after fitting.

How does this upgrade change towing and hauling performance?

When loaded or towing, the 3611-YHD greatly reduces rear squat and the bounce that saps control. Drivers will notice improved stability, reduced sag, and firmer contact between tire and road under load—especially during acceleration and cornering while towing.

• Increases rear leaf spring stiffness by up to 50% for stronger load support
• Reduces rear-end sag and improves level stance when hauling
• Helps maintain better tire contact and steering feel under load

Will this affect everyday ride comfort when the truck is unloaded?

The RAS 3611-YHD is designed to preserve normal ride quality when the truck is empty. Unlike air springs or very stiff lift-style springs, this 3-in-1 helper maintains comfort while delivering extra support only when you need it.

• No stiffening of the ride in unloaded daily driving conditions
• Works progressively, engaging as load increases for balanced comfort and control
• Maintains factory ride height so handling geometry remains unchanged

How difficult is installation and will I need any special maintenance?

Installation is designed for simplicity—many users fit the 3611-YHD in about 45 minutes with basic hand tools. The assembly is maintenance-free and requires no air lines, compressors, or ongoing adjustments, making it a low-hassle upgrade for owners who want reliable performance.

• Direct-fit design for Ford F150 4WD models from 2009–2025
• Typical install time around 45 minutes with common tools
• No upkeep, no adjusters, and no air systems to service

What makes the RAS original product different from knock-offs or alternatives?

RAS products come from the original RoadActive Suspension team with decades of track record and manufacturing in the U.S. Look for the RAS trademark to ensure authenticity. The 3611-YHD combines helper spring, sway bar stabilizing effects, and traction assistance in one unit, backed by proven testing and long-term durability.

• Manufactured and engineered by the original RoadActive Suspension builders in North Carolina
• Combines three functions—helper spring, sway-bar-like stability, and traction aid—in one part
• Proven on-road and off-road durability trusted by many owners over years

Who is this for? The RAS RoadActive Suspension 3611-YHD is intended for Ford F150 4WD owners (model years 2009–2025) who tow, haul, or carry variable loads and want a factory-like ride when empty plus confident, controlled handling when loaded. It suits daily drivers, regular tow operators, and anyone seeking a low-maintenance, long-lasting suspension upgrade without altering vehicle height or adding complex air systems.