The Stovebolt Site Forums The Shop Area The HiPo Shop Bump Steer

I have a Chevy 53 3100 that I just converted to power steering with a bolt on kit.
I'm now experiencing bump steer and in search of a way to correct it.
My definition of bump steer is when I go over a bump the front wheels jump or turn] to the left.

Do you have any advice?
Wheels are alined to spec.
New king pins and bushings.
Tighten all steering u joints in the new modification.
Increased the pressure on the steering box.
The steering box does not seem to have any adjustments.

thanks
-john

What kind of steering box did you use? What about the drag link? Is the pitman arm parallel with the steering arm?

More caster sometimes helps, which is achieved by shims. It mighty end up higher than spec but I don't worry about that more so how it drives. You could also Get a steering stabilizer, they can do a lot to reduce bump steer. They're available through Napa usually or through places like So Cal Speed Shop.

Classic Performance Products
Power Steering For Early-To Mid '50s GM Trucks

yes the pitman is parallel

drag link installed correctly too

I would upload a pic but I don't see a way to do that

-john

Thanks, We discussed castor but were unsure how many degrees to try and weather it would create other alignment problems

I found a stabilizer online
http://www.classicparts.com/1947-59-Steering-Stabilizer-Kit/productinfo/76%2D991/#.U4FmWsZv1uY

But still searching for installation info and weather it would help bump steer

In my opinion you have another issue, not bump steer. Are your front shocks in good shape? You mentioned "Increased the pressure on the steering box." How and why did you do that?

This link provides information about "Bump Steer"
http://en.wikipedia.org/wiki/Bump_steer

I looked at Classic Performance Products website, is this the kit you installed?
http://www.classicperform.com/tech_articles/Power-Steering-Trucks/Power-Steering-Trucks.htm

I don't quite understand because it is the drag link that needs to be horizontal, not the Pitman arm. I am not a power steering expert but strange things can happen if the gain or assist is too great.

The '54 is still an I beam axle right? You just replaced the steering box and all else is the same? You didn't lower it did you?

I switched out the 2° caster shims for a set of 4° shims which is supposed to work better with radial tires . It made a considerable improvement. I have far less wander on even the worse roads and bump stear is improved. Don't know if that will help with your power steering set-up

I went to the site where you bought the stuff, they had a good tech on how to mount the pump but all else is vague. The drag link from pitman arm to the steering arn on the spindle has to be deadnuts level at ride height and as long as possible.
can you show us a picture of what your looks like? That site didn't provide a picture 'as assembled'.
If the draglink is running up or downhill you might be albe to correct by bending the steering arm or making some spacers, need more info.