Abstract: A cab suspension system comprises an active, computer controlled damping mechanism positioned between the cab and the truck frame, at the rear of the cab. Further, corner mounted high and low level passive damping mechanisms are provided at the front of the cab. Also, a torsion bar is engaged centrally across the frame members beneath the cab, the torsion bar controlling side roll and sway, as well as acting as a radius rod to limited fore-aft travel of the cab.

Abstract: A control system for a two-wheel/four-wheel drive vehicle having a rear axle which can be operated in a high speed mode or a low speed mode and a front axle which can be drivingly coupled to the engine power train to place or maintain the rear axle in the low speed mode when the front axle is sensed to be engaged. The control system includes several switches. A first switch is provided for sensing when the front axle is drivingly coupled to the power train. A second switch is associated with a speed selection control system of the vehicle for causing the power train to be driven in a low speed mode or a high speed mode. A third switch is coupled to the first switch and is responsive to sensing of the front axle being drivingly coupled to the power train for preventing the second switch from causing the rear axle to be driven in the high speed mode and for forcing the rear axle to be driven in the low speed mode so long as the front axle is drivingly coupled to the power train.