Bump steer question

Is the front end excessively lowered or raised? Is the rear? Other than that check EVERY moving part for play, breakage, damage. Rusted, cracked frame or parts. I advise you to get a friend to help. Have him move and wiggle the steering wheel in various ways left to right. Look at every moving part starting at the column. Look at the column and steering coupler and look for play. Then look at the coupler and the steering box shaft. Then look at the coupler and the pitman shaft. Look not only for play between the two, but movement of the pitman shaft up/ down and side to side. Look at the pitman arm and the ball into the center line and look for play there. And so on. Each piece, each tie rod end

GO TO MyMopar and download a free service manual. READ the front end and steering sections on how to check ball joints. You must support the lower arms to check the balls to relieve weight from them.
Check wheel bearing adjustment.

Do this systematically and carefully and take lots of time. If proper alignment does not pan out, try a different set of tires.

AND DO NOT FORGET that REAR suspension problems can "fool" you into a front end problem