Toyota Tundra 1999 - 2021 | HD Kit

Get the best of both worlds with this authentic RAS® Heavy Duty RoadActive Suspension kit -- the only solution that strengthens leaf springs by up to 50% while providing a more smooth, controlled ride at all times.  Unlike other suspension upgrades that need constant adjustments & maintenance or negatively impact unloaded ride, RAS® greatly reduces squat, excessive bounce and body roll-- without hassle or sacrificing comfort .  This 3-in-1 system offers the benefits of a helper spring, sway bar, and traction bar at the fraction of the cost of other upgrades. With a quick 1-hour installation and zero maintenance, it's the simplest most effective way to reduce squat and improve your truck's towing/hauling performance. Beware of cheap knockoffs -- trust the original, proven RAS® FAQs (squat reduction, ride quality, how it works) How does RAS® work? RAS uses a variable-rate tension coil spring that attaches directly to your rear leaf springs. It works like a muscle, progressively e