The R4Tech system is a hybrid air-over-leaf suspension system featuring Firestone Airide air springs, Firestone Ride-Rite air accessories and Sanluis Rassini suspension technologies.
Designed to replace the factory leaf spring suspension, the R4Tech system comprises a Firestone air spring and Sanluis Rassini's leaf-spring suspension, positioned in a unique architecture to create a fully functional system that adjusts for varying load capacities.
The Lifted R4Tech system is available for trucks with 6-inch front lift kits. The Lifted R4Tech system is rear-only, so enthusiasts will need to buy a front-only lift kit that will be paired with the rear Lifted R4Tech system.
Developed to allow the suspension to move at all load conditions, the R4Tech system isolates and absorbs road impact for passengers and cargo, delivering an improved ride at all times by utilizing the variable spring rate of the air spring to stiffen when the truck is loaded and soften when it's unloaded. It also increases axle control during acceleration and braking for improved torque management and reduced wheel hop.
The Lifted R4Tech system comes with the Rassini foundation suspension - including leaf springs, lower trailing link, J-spring and mounting brackets - the Airide air spring and an air compressor control system that maintains the proper air level in the spring for the exact load you're carrying. Shocks are not included in the lifted systems.
Professional installation is recommended for the Lifted R4Tech systems, which installs using the original suspension holes.