Cool, thanks. I've also narrowed down that it doesn't do this when the shifter is in "L", but can make a REALLY nasty noise on the 1-2 shift if you attempt it manually. Does that further support a sticky B2?

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'82 300CD
"Pearl", the very first turbo diesel 123 coupe
Totaled 11/23/18, rebuild in progress.
'85 300TD, "Artemis".
'78 300D euro, "Ol' Red", mostly retired.
'85 300D, "Gandalf".