[mr48chev]

I think the bump steer issue can be fixed with normal and proven methods.

Have you checked the truck over closely for worn front suspension and steering pieces. Have you had the alignment checked to make sure the caster and toe in are within specs? Unless the truck really hit something hard with a front wheel the camber should stay within specs.

What about rims and tires? Deep reverse rims like a lot of guys stuck on these trucks in the 80's and 90's can cause bump steer or accent it.

I don't remember seeing anything that said it had been lowered but from personal experience on my own truck removing leaves from the front springs and changing the angle of the drag link can and most likely will cause some bump steer.

A good steering dampener like a lot of the 4X4 brigade runs might lessen the effect a bit but isn't a cure. It might also cause a bit more resistance on the already (for some) steering effort.