I have a 1997 Isuzu Rodeo. The steering wheel shakes when driving straight. It is worse between 45 and 50 mph but shakes at other speeds also. It is not as pronounnced if you are steering either left or right. I had the wheels balanced and the front end align when I started noticing it. The alignment and balance had no affect. It has since gotten worse. Any ideas - ball joints, bushing, rotors? Any advice appreciated.
JGH