Really it sound like either a problem in the valve body or clutch packs going out.

I had the same thing happen in my 240D. Has the transmission been overfilled??

Excessive pressure can cause these sytems but usually by now its too late. I don't think its the B2, I changed the seal in mine and it still did it.

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Ryan
1985 300D Turbo Diesel
1984 200 Euro