Yes, of course you're right and I can't deny that it could be the diff but I don't hear a change in note when the gearbox is under load. That gives me hope that it's a wheel bearing problem that will not cost me an AAAL to repair!
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Originally Posted by rover54
Why can't it be the box. Just because you put the gearbox into neutral doesn't mean the gears aren't still turning, all gears are in constant mesh but not under load and driving. The diff is still turning as it is attached to the road wheels and the diff is still connected to the output shaft of the gearbox. If you have excessive free play in the diff pinion you should get a change of note when the drive chain is not under load with the box still in gear. Bearings normally grind, gears whine.
Jack each wheel up and listen to the bearings, if the wheels run free and make no noise (no gritty sound), then your problem is with the box.
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