Could that be a possible cause? Ever since my steering pump spit off the belt and started making noise late last fall, the wobble has been getting worse. Wheel bearings are fine, trunion bearings are fine, preloads are all within spec. (front end completely rebuilt last spring) Rod ends are new, Tires are balanced and the the toe has been set in about 1/4" and still have lots of wabble between 40-50mph. I'm stumped. Could the pump be pulsing and causing the wobble?