does anybody know the reason why my truck does this?

[blueb8llz]

nope that wasnt the problem. i tried putting the washer front and back and didnt work.
i wanna say its the tires that is doing all this cus when i have the truck in the air, and give it throttle, my truck shakes a pretty good amount. so theyre pretty unbalanced. but someone said they have had some bad unbalanced tires in their days, and he never had this problem.
oh well, i guess ill have to live with this. thanks to everybody that contributed any help. i really do apppreciate the great tips and info, maybe it will help somebody else down the line.
BUT if you guys happen to think of something else, please post back on here.