Thanks. I've seen "chassis ears" popular in USA but expensive. There is a DIY version using lapel microphones, extension wires and a laptop recording to an audio program which I could try.
In the meantime I've just removed the propshaft and shall drive home shortly. What I don't understand about this rear diff test is that the propshaft is disconnected from the rear diff by the Haldex in normal driving as I understand, so should have no influence on the rear diff . . . I'll report back.
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