I've got a weird low sounding droning noise that I can slightly feel on the floorboard at 75-80 mph on an '02 Disco II SE7. The tires are good...not chopped and are balanced. And it still makes the noise after I have the tires rotated, so I've ruled out the tires. I just replaced the front drive shaft thinking that would solve it and it didn't. I've had the rubber connector on the rear driveshaft checked and it's in good shape. I don't drive above 80 mph, but the other day I noticed it stops making the noise when I get above 80 and it doesn't make the noise below 76/77 mph. Someone could simply say to not drive at that speed, but now that I've found the noise I want to fix it. I felt like I've checked everything for a vibration noise. Could it be a wheel hub? Has anyone ever heard of anything like this or does anyone have some suggestions? Thanks.

Ryan