For sometime now, like over 2 years, I've had unusual tire wear caused by the front driver side. The tire wears excessively high on the outside. Is this caused by a camber/ caster bushing, tire rod end or the wheel hub?

im not for sure, but i think you need wheels balanced/alignment....or have been taking turns at very high rates of speed

edit; not sure why its only one side though....

Every time I've gone to Firestone and had the alignment ( tow, Camber ) readjusted a mechanic has told me the front driver side camber is out by negative 1 deg. Makes for some interesting tire wear.

well idk but could check for play at tierodends...and jack wheel up and shake wheel for play

Ya I'm thinking I will have to do that. I notice a slight inward tilt on the tire with my Jeep just sitting there, but I do know my alignment is out.. too much play in the steering column.