RAS RoadActive 4611-HD Rear Leaf Spring Reinforcement Kit for Chevy/GMC 1500‑3500 — Heavy‑Duty, Bolt‑On Towing Support

This heavy-duty RoadActive system is engineered and assembled in North Carolina to support trucks used for towing and hauling. Designed to work with existing leaf springs, the 4611-HD boosts rear spring stiffness without adding air lines, compressors, or ongoing adjustments. It targets drivers who need immediate, maintenance-free improvement in stability and ride quality when their pickup is loaded.

How will this kit change towing and hauling performance?

The 4611-HD increases the effective spring capacity so trucks resist sagging under load and recover faster after bumps. You’ll notice reduced rear-end squat, improved pitch control when accelerating, and fewer sway triggers from crosswinds or heavy trailers. This leads to better steering response and a more confident feel behind the wheel.

• Strengthens rear leaf springs up to 50% for added load support.
• Reduces rear squat by roughly 2–3 inches in many applications.
• Combines helper spring, sway-dampening, and traction support in one unit.

Is installation difficult and will it require future upkeep?

The kit is designed for bolt-on fitting and can typically be installed in under an hour with standard tools. There are no air bags, compressors, or regular adjustments to manage—the system begins working as soon as it is installed. Because it’s a mechanical, self-contained design, the need for routine maintenance is minimal.

• Simple bolt-on hardware, installs in about 45 minutes for most trucks.
• No air lines, no compressors, and no daily adjustments required.
• Durable construction minimizes long-term servicing needs.

Which truck models and years will this 4611-HD fit?

This RoadActive 4611-HD is made to fit a wide range of Chevy and GMC pickups: 1500 models from 1990 through 2024 and 2500/3500 models from 1973 through 2010. It is important to check specific exceptions before ordering because some late-model platforms and factory suspension options are incompatible. Confirm fitment against your truck’s model year and rear spring configuration.

• Compatible: Chevy/GMC 1500 (1990–2024) and 2500/3500 (1973–2010).
• Not compatible with 2022 single rear leaf 1500s, 2015–2018 vehicles with Magneride, or 2025 1500 models.
• Always verify exact leaf spring type and factory options prior to purchase.

What makes RAS RoadActive different from air bags or other helpers?

RoadActive’s design focuses on passive, mechanical reinforcement that acts immediately under load without user input. Unlike air systems, it doesn’t change ride height or require pressure management, and it avoids over-stiffening the unloaded ride. The 4611-HD aims to preserve everyday ride comfort while delivering heavier-duty support only when needed.

• No inflation controls—performance is automatic based on load.
• Engineered to improve stability without producing a harsh unloaded ride.
• Tested for durability in heavy-use towing and hauling environments.

Who is this for: The RoadActive 4611-HD is best for Chevy and GMC owners who regularly tow trailers or carry heavy payloads and need a reliable, low-maintenance rear-spring upgrade. It suits drivers who want measurable reductions in squat and sway without adding complex systems, and who require a durable, U.S.-assembled solution for improved control and spring longevity.