2 vs 1 pc driveshaft.

[Denisefwd93]

update: all this time it's been bad tires that were "new" on the truck. The violent shaking is gone at 35 & 65 mph. When my truck was in the shop and on the lift, tech showed me the drive shaft spinning, held a pencil or pen against it, smooth!
Still lots to do on this truck but I can at least drive it now!
if there's a moral to this story no matter how much you want to believe it's not the tires, the only way to find out is to actually change the tires!

 

[85_Ranger4x4]

To counter that I thought it was my tires so I got different ones... but it turned out my driveshaft wasn't made right.