Cams hydraulic Chain-drive 4x4, about 7 feet of up OR down motion on each tire: specs below Engine is a fuel injected Ford 5.0 V8 out of a '93 cobra mustang, c4 transmission out of an early bronco. 9" w/ 5.38 gears and ARB air locker mounted in the center (below driver) running chain gears on the ends where the swing arms pivot. Swing arms are hydraulically controlled individually or together, and there is coil spring and shock suspension as well. large chains running inside the swing arms turn hummer gear reduction (2:1) hubs at each wheel. tires are 39.5". The steering is linked through the swing arms as well and the steering box is mounted just infront of the axle below the driver. body construction is steel tubing (mostly DOM) and the total weight is 5900 LB..