URL: http://www.earlycj5.com/tech/steering/bumpSteer_files/bump_steer.shtml

Date Submitted: 10/20/05

Description: I picked up Polluto, a 1970 CJ-5, from the P.O. and drove it home. I was at a loss of words when I hit the first bump! I had some major work to do… if I could only survive the drive home. After working on the front end, resulting in new everything (king pin bearings, knuckle u-joints, knuckle seals, wheel bearings, 11” brakes, hubs, shackles, etc) I still had major steering issues. To see the problem, one just needs to turn the steering wheel and observe where all motion goes. There were two problems: bump steer and steering hysteresis (backlash).

When the P.O. jacked the suspension 2.5”, it changed the steering geometry. Bump steer goes as the tangent of the drag-link angle; you want the nominal drag-link angle as horizontal as possible. The following picture shows about a 15 degree angle. In fact the ball joint on the bell-crank is at its maximum travel in its nominal position! This is not good design and has potentially catastrophic stress when the suspension unloads.

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