Tires perhaps? My 95 Villager would start vibrating right around 70 mph. When I replaced my rear tires the problem went away. The tire tech said that one of the belts had snapped in the tire. It runs great now.
Warped rims or discs
wind noise
about 34-37mph
It is a measurement of speed.
70mph
34 miles driving at 70mph requires 29.1 minutes.
http://www.wolframalpha.com/input/?i=200+miles+at+70mph
70mph
You wont hear much of a sound, but more of a vibration at certain speeds. I recently installed a set of tires on my truck and because of an inbalance, around 70mph the truck would start to shake. Once I had it corrected it was smooth sailing.
could be u-joints or transfer case. gm Jim
70mph stock
70mph