SHAKING/BOUNCING KING PINS MAYBE ?

Did the tire shop use balance beads or actual wheel weights?

In my experience the beads are useless and will cause this issue at intermittent times.

I never experienced bad kingpins but I assume the front end would shake all the time if they were bad?

 

What axles do you have? Might want to look very closely at your anchor pins for your brake shoes. If they are worn even a little it will cause your shoes to drag lightly on the drums. It can certainly cause strange vibrations especially after they begin to warm up.

You can check your king pins by putting long pry bar under the wheel and lift. Have someone do that while you look for play. A shop probably wouldn't even charge you to do it if you asked nicely.

If they are worn enough to cause your issues that would have been obvious on the tire wear of your previous set of steers. A good shop should be checking for anything loose or worn when they do tires anyway. Double that sentiment since you should have gotten an alignment too.

 

Any rusty dust or rust streaks around the u-joint caps? I have seen several that felt tight but were rusted up and beat to crap inside the cap.

 

Drive tire out of round.

 

A couple of things that haven’t been mentioned, 1) have you checked the play on the 2 piece slip driveshaft ? The splines wear out if not grease properly. 2) have you check the air bags height ? It’s usually in a decal on the frame for the correct height.

 

Looks like the wheel bearing is slightly loose. I couldn’t see the king pins moving, but wheel yes.

 

Definitely looks like the wheel bearing is loose. I couldn't really notice any slop in the kingpin either.