RoadActive Suspension Custom Leaf Spring Enhancement Kit
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2015 Ram 4500
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2015 Ram 4500
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When you’re towing a camper, trailer, or hauling heavy gear in the bed, sag and squat can throw your handling off. The RoadActive Suspension Custom Leaf Spring Enhancement Kit adds up to 2,000 lbs of load support by turning your factory leaf springs into a mechanically active suspension system. The variable-rated coil tension springs automatically adjust to your load, keeping your ride level from front to back so steering, braking, and headlight aim stay where they should.
RAS reacts instantly to extra weight, absorbing and supporting the load before sway or bottoming out can start. When unloaded, the tension springs disengage so your truck rides just like stock—no stiffness or bounce. You can also adjust coil tension during installation using the included spacers, setting it anywhere between 25 percent and 40 percent for your towing or hauling needs, or even balance off-center loads side to side.
Heavy loads can twist factory leaf springs enough to cause axle wrap and wheel hop. This kit stabilizes those springs by absorbing the load’s force so the tires maintain grip. That means less jarring movement when you accelerate or brake hard and longer life for leaf springs, shackles, shocks, and tires. You’ll feel steadier traction pulling away and better control when slowing down.
Cornering with a trailer or passing a semi can make the rear of your truck shift uncomfortably. The RAS system strengthens the leaf springs to reduce sway and dangerous body roll so your vehicle stays planted through curves, turns, or gusty crosswinds. It also cuts down on rocking when hauling tall or uneven loads for more stable handling every mile.
Each unit comes fully assembled for an easy bolt-on install with no drilling, cutting, or welding required. The high-grade alloy steel construction with epoxy e-coated coil springs and corrosion-resistant brackets gives it a salt spray rating of more than 800 hours. Once installed, no adjustments or upkeep are needed—just dependable suspension support every time you tow or haul.
Ratings & Reviews
Mike L.
6/23/2026
Nicely done, Sam! Thanks for the photos, we always appreciate those!
John
9/14/2026
Well It has not failed me yet. Being basically a spring under load all the time I am assuming the spring will stretch some over time and I will have to adjust tension accordingly. The pickup sits nicely on the thinner washer setting so I am leaving it there and hopefully that will help the system last longer.
Brooke M.
6/25/2025
Looks great, Les :) I hear lots of good this about this option for suspension enhancement and how you said, even without towing it can improve the ride quality. Glad to know that you are happy with them, too! do you have any upcoming camping trips planned?
Gwendolyn Y.
7/23/2025
That's a long trek, so I'm glad these helped you along the way! Do you take that trip often, Elden?
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Rocky C.
10/1/2021
Still happy! No rust and still works great.