death wobble?warped brakes?

So I know I need to replace my track bar ball joint it has slack and pops when I turn back and forth but when the trucks cold it drives great no shimmy no shake no pulsing brakes but once it warms up you feel a lil brake pulse after using them a bit. Then after heavy traffic and repetitive use the pulse bad and truck has a bad shimmy at speed and when you apply the brakes it only gets worse till you slow down then the shimmy goes away and the brakes pulse bad... any one know what's going on?

Warped rotors it sounds like. I have the same issue.

Yep sounds like warped rotors, and possibilly a bent rim, or out of balance tire if it shakes when your driving. Warped rotors should only really affect you when you are stopping.

And the death wobble is different then what you described. I have experienced it twice in my truck. Hit a bump just the right way, at the right speed, and the truck dances you to the side of the road in a hurry. Like you have no option but to pull over, and is borderline out of control.