I have a 1993 ETC that acquired an intermittent shudder while driving. It began happening at speeds around 55 mph (it felt like you were driving on flat tires, with steering wheel vibration and rear view mirror shaking) and would stop when you came to a stop. It has gotten worse and can happen even at 40 mph (still intermittent). I was told it wasn't the tranny (torque converter, especially) because if you put it in neautral while experiencing the shudder, the shuddering does not stop. Could it be the drive axle? Any suggestions are greatly appreciated.