This is the problem I am having.
I have a 2006 X , 6cyl, Auto Transmission, 33's, 4in lift, 4.56 gears
When I am driving I get a vibration in the drivetrain at around 41-46mph with over dive on.
If I have overdrive off I do not get this vibration.
Other than that it rides and handles like a charm. Not knocking or other strange noises.
If anyone could give me any information on this I would greatly appreciate it.