Mark---Do the simple checks first, I always say. Especially if it
doesn't require buying unnecessary parts.
You mentioned that the sound went away with the car on stands, in gear,
with the wheels off. The angle that the axles U-joints operate in change
with varying loads. Check these 'joints for bad bearings. The sounds of
broken bearings will telegraph, and can change pitch with road speed,
regardless of the gear selection.
To some degree the same goes for the U-joints on the prop shaft, but
these usually produce a vibration felt thru the gear shifter.
Come back..
Dick
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