My Tranny works now! Woo hoo. Symtoms were after warmup and on long drive it would not upshift until it hit the max shift point. It would be stuck in 2nd gear on highway at 60 mph. Occassionally it would slip into high gear or get stuck in between and flare. Adding fresh tranny fluid helped.

Problem was the tranny cooler was plugged. I replaced radiator with integral tranny cooler from my parts car which had a new one. Now the problem has not come back since. its been 4 days of driving now. Blowing through the tranny cooler on both radiators you can tell which one is plugged. One side effect is my engine runs a few degrees hotter at times. But overall its between 90 and 100 all the time mostly at 95 i would say. I haven't seen it go over 100C since the radiator change even up big hills with a trailer. Very pleased.

Check your tranny cooler. If you tranny cooler line is super hot to touch on both sides of the cooler you may have a restriction. Mine would burn my fingers.

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What Would Rudolph Do?
1975 300D, 1975 240D, 1985 300SD, 1997 300D, 2005 E320 , 2006 Toyota Prius