Highway viberation

[95offroadx]

i just got back from a 300 mile trip in my explorer, and i noticed that it starts viberating at 65mph and gets worse the faster i go, it only gets really bad while cruising a 85mph, it did this before when i had my 33's on, but i made this trip with my stock wheels and tires, soo i dont know what it could be

you guys have any idea?

 

[IZwack]

Could be a few things but first thing I'd do is to get it in for a computer alignment. That'll dictate whether or not its a wheel/tire/axle problem. If the alignment says everything is within specification, then you can move on to looking at other things "upstream" of the drivetrain such as the driveshaft.

 

[Jason94sport]

it only gets really bad while cruising a 85mph

Wow! You can cruise at 85? I'm lucky my X will do 75. If I try to push more then that it complains really bad.
Did it have the vibration before the 300 mile trip? Was it something that just started? You could have thrown a wheel weight. I'd get the balance checked first. It will be cheaper then the alignment.