Axle tramp… what is it?

Axle tramp is bump steer with torque.

A ‘tramping’ axle is more common with a leaf-sprung suspension than with independent or coil suspension, because the latter types have widely-based control arms or wishbones to control axle rotation. When you feed engine braking torque into an axle, the axle tries to rotate with the force that’s turning or stopping the wheels.

A leaf spring has to perform the double duty of suspending the axle and resisting torque, so can suffer ‘wind up’ when there is a great deal of torque applied, letting the axle rotate forward or backward a little then whipping it back into line. A severely tramping axle losses contact with the road and can result in loss of vehicle control.


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