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if the wheel alignment is faulty ( castor wobble ) at 70 mph there is no way that you can describe it as a vibration as it virtually rip the steering wheel out of your hands. If it is a torque converter problem then at around 3850-4025 rpm stationary there will be a vibration of the vehicle and engine The sort of vibration that you are experiencing at 70 mph will come from a drive line problem. If rear wheel drive then it could be faulty "U" joints, worn slip joint or failed rear engine mount
If front wheel drive it may be cv joints or bent drive shafts,wheel bearings or brake callipers not moving freely on the mounting bolts.
Is the engine light on? If not, It'probly time for an idle air control valve. Also check the motor mounts. Put the car in drive, hold the brake and give it some gas. Do the same thing in reverse. If the motor moves more than a few inches, you may have a broke motor mount.(you watch the motor, let a friend work the gas)