I have a 91 ext cab v6 4x4 with auto trans.

I have a high speed brake vibration. I just installed new pads rotors seals and repacked bearings and replaced rear brake drums and the steering idlerarm, had 2 front tires balanced.And it is still there..
No the wheel does not rock at low speeds.

I need some help!!!!!!

My next guess is the stabilzer in the front.

The rotors and drums are good quality brembo stuff. And just get this out of the way they have been replaced 2 times now. So I know it is not a brake issue.