Originally Posted by CALL911

Max, I've got the same problem at around 70. I've got after market wheels and 295 30 19s on the rear. This did not occur with the old setup. The strange thing is that it is not constant, but has that "thrum, thrum, thrum" thing going on which tells me it is not a wheel balance issue. I'm about ready to get new rear tires. We'll see if that will solve the problem.