The tire swap test can be easier to set up at the dealer if they have either some old take-offs that will fit or a used car/trade in with wheels that will work... Just can't use another customers wheels obviously unless consented to.

Also, if the front and rear tires have different enough rolling diameter (which changes with different brands etc.) the x-drive transfer case can cause a unsteady wobble type feel in the drivetrain. If this is suspected they can simply unplug the VTG actuator motor and drive it to see if the feel went away. But that can usually be felt around 35-45 mph as well.

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2003 4.6is