Quote
PwrWgnDrvr
Norm, u need to correct this part:
>>Any change in suspension position changes the angle and therefore the length of the steering arm and/or drag link.<<
Those parts do NOT change length. If they did, there would be no bump steer.
Yes, what I should have said is: as an axle drops it pulls down on the steering arm and changes the DISTANCE from the steering box, forcing the road wheels to follow the arm. The length of the steering arm remains constant, however because the arm changes relationship to the axle, it pulls or steers the axle in an unintended direction.
Keep in mind that this is more prevalent on cross-over steering setups than the front to rear, short arm setups on our trucks.
With short arm systems you "feel" more input through the steering wheel, but there is less actual change in steering direction.
With cross-over steering there is a longer steering arm and less input is transmitted back to the driver, but more input is transfered to the road wheels.