I thought it was torque converter. I've been meaning to change the tranny fluid, but haven't got around to it Maybe it would remedy this issue.
At any rate I still have no idea, mor investigation tommorow. Both crankcase and ATF levels are A ok...

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1976 300D
190,000 Miles
Colorado Beige

1975 300D
Parts Car
78,000 Miles
Rustbucket
Also Colorado Beige

1984 190D 2.2 (Dad's)
156,000 miles
Champagne Metallic Clearcoat