Some cars utilize a variation on the traditional leaf-spring design. GM's Corvette, for instance, uses transverse leaf-spring suspension . In this arrangement, a single, high-performance leaf spring runs parallel to the rear axle, attaching to the wheel hubs at each end. They also are better than coil springs at transferring forces from the road to the frame. Plastic inserts will generally fix this.
Torsion bars represent a third kind of vehicle suspension.
In this design, a steel bar takes the place of a leaf or a coil. One end of the bar is anchored to the vehicle's body, while the other is free to turn. A lever arm attaches to the free end of the bar, and then to a calibrated suspension device. When the vehicle strikes a bump, the bar's resistance acts like a spring. They have the advantage of working where a traditional coil spring or MacPherson strut may not fit, and also can be used to adjust a vehicle's height.