Quote:
Originally Posted by Seasparrow
Swerving back and forth produces no change in pitch
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That would likely rule out the wheel bearings, in my experience.
If reducing the load (by lifting the throttle) reduces the noise, it's more likely the ring & pinion gear and/or their bearings.
If the rear diff has never been serviced, it could use fresh lube anyway. Try Lucas 80W-90 as mentioned earlier and see what effect it has on the whine under load.