I have 96 Chevy Impala SS, the car tends to wonder over the road. When it was new it was not as bad as it is now. I constantly have to move the steering wheel to maintain the direction. It has 255/50/18 tires and 120,000 mile on the odometer. I have done an alignment, and have installed new tires, but it did not help much. I can not find anything loose at the front end or I am not strong enough to simulate the road conditions with my arms and hands. It is basically Chevy Caprice with hard suspension and wide tires.
When do I need to replace the ball joints and the tie rods or how to tell that they are worn out?
Is there anything in the rear suspension to look for?