check the drive shaft to see if one of the weights fell off of it. they are ballanced from the factory, but one of the weights might have came off over time.

 

alright Ill take a look at the shaft tommorow and take fer up to the tireshop and have them look at all four, but now that you guys have mentioned it, I dont feel it in the steering wheel, however if i let go of it, it shakes rapidly from side to side. I already know my wheels are way out of alignment I can go around a right turn without touching the wheel.

 

My truck did the same thing my front tires were messed up, when I bought new tires the problem stoped.

 

Blub ats as cold as a frozen over hell and rainy this whole week so Ive been lazy and not looked underneath however, ive noticed then when the shakes start i can physically see the bed bouncing around in the side mirror. So I think this definantly points to the rear end.

 

my bad, no rear end, I took it to the shop to get it lined up, and as I observed them they inspected the front end and the front wheels were bouncing around when they pushed on them... ball joints... they said 900 bucks, I said screw you, and took it to another shop, now got her back, it goes in a straight line and i can go at highway speed with worrying about being thrown into an epileptic fit.