ok brought truck home for the night..
the mopar technician said it had a performance programmer that was removed..and the fuel pressure was set up way too high..and timing was 26* retarded..?
he said he reset it back to stock...the noise/vibration is less noticable..but still there.
it does need front u joints but i dont think this is the issue...it makes the same vibration at lower speeds as it does at higher speeds and seems to be throttle imput related..? feels like a hydrolic pump vibration...like power steering.the power steering is fine..but maybe its trans pump or high trans fluid/pump pressure?

You guys that tow...Do you use the Tow/Haul setting? what the heck does that actually do.. Other than kick the truck out of overdrive..?
you can't actually tow on the highway with it on do you? it leaves the rpms way up crazy high..i cant imagine towing long distance this way...what gives?

cheapst