Regarding running in 2WD without the propshaft - I'm struggling to locate a whine at present on my 2005 D5 auto XC90 and have removed the propshaft to eliminate it from my enquiries . . . my whine is still there, but the car drives fine (perhaps slightly better) with no warning lights or issues showing. If the front wheels were to lose traction, I guess the Haldex coupling would engage as normal but with no prop, the rear wheels wouldn't be driven to help out.
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