International Truck and Engine has relocated the cab suspension system outboard to deliver improved comfort and stability on its 9000 Series sleeper cabs. The newly designed system allows for less cab roll and sway, and more stability, thus affording better control and more comfort.

The suspension system supports the weight of the truck and provides the driver and passengers a more comfortable ride. Its components include front-and-rear suspensions, springs, shock absorbers, torsion bars, axles, a strut system, and connecting linkages. A number of changes have been made.

They include locating the air bags and shock absorbers farther apart and outboard nearer the edge of the truck. This provides more stability, especially in cross winds, by limiting the pitch and yaw in the cabs, which makes the ride much smoother.

The number of bumpers has been changed to two, also to help with the yaw and further to provide more resting surface for the cabs when they’re stacked to reduce damage from bumps. The bumpers have been centered over the mating stop to allow the full face of the bumper to contact the stop, also improving ride performance.

Because a sleeper cab is longer, more surface area on its sides becomes exposed to the wind. When crosswinds develop, drivers and anyone trying to nap in the sleeper feels the roll and swaying. But with the shock absorbers and air bags located farther apart, the ride becomes smoother and more stable, says International.