I'm having issues with my trans too. It sometimes takes up to 3 seconds to go from 2nd to 3rd. Sometimes called a flare I guess. Other shift points are ok. Also, trans is making some racket - I think it might just be the bushings.

Would that be the infamous B2 piston?

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Codifex
1981 240D ChinaBlue (Got her running with a donor engine.)
1983 300DTurbo w/sunroof.
1984 300TD manual sunroof. (Electrical Gremlins)