I replaced my p/s pump and gear box recently and the bump steer with the new box is WORSE than the old worn out box. The old box had slop,but didn't shake the steering wheel with every bump. The new box is tight, but every little bump spins the steering wheel. I've thought about adjusting the adjusting bolt on the gear box, but I don't know if that's what that bolt is for. There's no play in the joints, I replaced them a few years ago and they're still tight. Any suggestions?