My transmission has started to slip in reverse. Takes a while to engage, then with a clunk. My thinking is it probably needs a rebuild with 223,000 miles. Trying to decide whether to have mine rebuilt or buy a Mercedes rebuilt unit. I have always changed my transmission fluid and filter at 30,000 mile intervals. I think the Mercedes one has a three year warranty but will have to wait until Monday to make for sure. What do y'all think?
Another question, did any of the 140 series S-Class cars have a 5 speed lockup transmission? And if so, would it fit and work in a 1995 S-350? Mine is a 4 speed that does not lock up.

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1995 S-350
370K + SOLD
1952 220B Cabriolet
39K kilometers + SOLD
1998 E300D
310K +
2012 E350 BlueTec
120K