Torsion axles are a type of suspension that uses a torsion bar instead of traditional springs. The torsion bar is attached to the axle and runs the length of the vehicle. As the axle moves, the torsion bar twists and creates resistance, which helps to absorb bumps and keep the ride smooth.
While they don't use traditional leaf springs, some torsion axles do have springs built into them. These springs help to further cushion the ride and keep things level as you travel over uneven terrain. No matter what type of suspension your vehicle has, regular maintenance is important to keep it functioning properly.