I have a 97 Tacoma ExtCab 4X4 V6 with automatic transmission @ 160K. When power is applied at medium and worse at higher speads there is a vibration in what seems the powertrain. When power is taken of the vibration goes away. I have looked quickly at the universal joints and drive shaft and both don't seem to have any play. Could it be CV joints? U joint or bearings? Any suggestions welcomed....thanks