blue_van - Upper and Lower Control Arms, Tie Rod Ends
The van had some serious vibrations at high way speeds. Also the tires were wearing badly up front. I found that the tie rod end ball joint where it attaches to the wheel hub was the culprit. It was badly worn. The other ball joints were not bad yet but were not far off either. This was a good time to refresh all the bushings up front. It was easier, and cheaper, to replace the entire control arm assembly including bushings pre-pressed in then to just replace the bushings and ball joints in the existing control arms. This is because Chevy make the ball joints fixed to the control arms. You have to air hammer them out. Ugh.
Replacing all these parts fixed the vibration issue and also made the steering feel more responsive. There is no more dead space where turning the wheel fails to trigger the wheels to turn.
I also found that both front wheel bearings are kind of loud. I would have replaced them but they are not replacable individually. You have to replace the entire hub assembly. That is annoying because of the price. At least GM has a good design because you can remove the hub without having to remove the upper and lower control arm ball joints. This means I can replace the hubs later when I have the money without having to destroy the ball joints.