Driveline vibration

[BYoung]

I have an 04 tacoma TRD 4x4 with 12 thousand miles on it. Since I got it, I've notice a slight droning or vibration at 50mph, cruising (not under accelaration). I had driveline vibration with my lifted Cherokee, but wasn't expecting it with a new non- lifted vehicle. Is this common among your trucks or is this something I should be concerned about? The service dept. at Toyota doesn't seem to be too concerned about it. Thanks

[Flash75]

If it isn't modified Toyoto should be concerned because driveline vibration isn't normal. Clifton