So yesterday i take a look at my rear u joint on the drive shaft and it was new but had a mark on one of the caps that looked like it was hit dead in the center of the cap. i took off the drive shaft and the rear u joint was very stiff and would stop and take more force to move it at a certain spot. Took it off and put a new one and pressed in the caps. The vibration at 65 is a lot less now.
I also measured my pinion angle and its off by 3 degrees, I've ordered the shims and should be here today.
I will get to the bottom of this vibration if it kills me.
So far this is whats done to the truck and still vibration
All the following parts are new
Drop coils
Drop spindles
Drop leaf springs
Drop shackles
Upper control arm
Lower control arm
Ball joints
Inner/Outter tie rod
Idler arm
Pitman arm
U joints
Rotors
Brake pads
New wheels
New tires
Alignment
Tire balance