Join Date: Sep 1999
Location: San Diego, CA
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Re: Bump Steer From Hell?
Well, it sounds like you have bump steer for sure. You didn't mention if your lift came with a dropped pitman arm or if you did any mods to the steering, but it sounds like you put the new springs/shocks on.
Bump steer is when you hit a bump and the springs compress the steering components turn. This happens when you lift a vehicle because the drag link that used to sit fairly flat (parallel to the ground) now is at a steep angle. The drag link goes from your steering box/gear to the passenger side knuckle. Since you are holding the wheel, the motion upward follows the arch of the now steep drag link which pushes your steering out. So as your springs compress the wheels turn and then come back to where they were when the springs come back.
The dropped pitman arm lowers the steering gear side so it sits more level.
I have hi-steering on my cj and can hit bumps at any speed with my hand off the wheel or on the wheel with no bump steer. My drag link is almost parallel.
I would recommend a dropped pitman arm for now. I think all 4" kits should have them included. They cost about $45-60. The old ones can be a pain to remove. Do a search and you'll get every idea out there on changing it out.
4.6 Stroker Scrambler