'91 rumbles at 120kmph or 75mph?

ya title is self explanatory....when i go on the highway and reach speeds that are about 120 or if ur american about 75 , 80mph- than the car starts to rumble, as in the steering wheel and the dash, just start to shake. i guess it cant handle it at those speeds???lol

I got the same thing in my 92, it goes away for a while once you get a front end alingment.

Check the tires, balance them and if the wear is uneven, get an alignment done. The rumbling noise could be a wheel bearing problem.