20K on a Mercedes remanufactured transmission or what? Mine is screwed-up too. Just under 50K on a rebuild from a mercedes only indy transmission guy here in L.A. I took it to him and he cleaned it all up and and we found a small amount of shavings in the bottom. he adjusted the modulator and its running much better but it wont last long. maybe 2k miles. he didn't think it was slipping and missing from governors or valves but from friction plate wear. Thats what he thought from the first drive around the block before he cleaned and adjusted it. Friction material wear is what he said. Seems simple enough, I guess.
I've seen exploded diagrams somewhere of this transmission. I'll look around online for some.
Good lock.
Jason

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1988 300CE 120K RIP(Midnight Blue/Parchment)
1987 300E 202K (Arctic White/Palomino)


Now I see the secret of the making of the best persons. It is to grow in the open air and to eat and sleep with the earth. ~Song of The Open Road