Hi @rroker.. I think they need to isoline first if noise is there while car is on “P” and play with engine to get it to higher RPM, if it is still there then this isolates all moving parts on wheels, brakes, suspension, and transmission and focus on engine and other moving parts like belts, rollers, or engine it self.
if noise is not coming on that state then with extreme cautions and proper safety preparations they can put the cat on the lift to just barely take the wheels off the ground (few centimeters) and ensure the car is stable and then engage transmission and start accelerating to simulate the issue and identify where it’s coming from.. highest suspects will be wheel bearing, drive shaft, transfer case, or transmission itself.
P.S. that last test need to be done by a very experienced person who ensures the car is fully stabilized on the lift before they engage the gear and will not change with vibrations once it’s engaged