this new diff has a pinion sensor, just one. It was clunking on the jack stands while idling in 3rd gear or higher. Might explain the loud howl I was getting at low rpms and high gears.. ie staring from a rolling stop in 2nd.

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08 R320 CDI current

Past
95 E420
87 300D Turbo 5spd
90 300TE
83 300SD
85 300TD
92 400E
85 190D