I just went through something similar. For me, it was an out of spec B2 Band. My reaction valve thrust pin came out (YMMV). Are you able to drop and inspect your transmission pan? Feel free to PM me with any questions. Michael

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Michael
Southern California/Santa Monica
1986 MB 190D 2.5, 5 Speed Black and Palomino "Mordechai"
1985 Porsche 928S (32V), 5 Speed
1980 Porsche 928 (16V), 5 Speed