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