The Collaborative International Dictionary
Sway bar
Sway bar \Sway bar\ (Vehicles)
A bar attached to the hounds, in the rear of the front axle, so as to slide on the reach as the axle is swung in turning the vehicle.
Either of the two bars used on couplong the oront ano rear sleds of a logging sled; also, the bar used to couple two logging cars.
Wiktionary
sway bar
alt. An anti-sway bar. n. An anti-sway bar.