You're looking at a 30 year old transmission and of course you give us no clue to mileage or any evidence of repair or replacement. You have a difficult problem to solve. I would suggest you look at a replacement transmission here.
http://www.mercedesnewparts.com/start.wws?cookieID=24L0UKU7F24L0UPC2N&clientid=mercedesnewparts

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Junqueyardjim
Christianity, if false, is of no importance, and if true, of infinite importance. The only thing it cannot be is moderately important. C.S. Lewis



1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA

2003 Jaguar Type X, AWD. beautiful, good mileage,
Mom's car, but I won't let her drive it!