Sounds like it to me:
Quote:
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Originally Posted by MBZ.org
The symptoms of a B2 piston failure are unmistakable:
-Fails without any warning whatsoever
-Slips out of gear in 1st with any load
-Massive flaring going into second
-3rd and 4th work normally
-Reverse works normally
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The (infamous) B2 Piston
Part Number:
1072700432, also needs 1262770850 gasket.
Some info on doing it on a w123:
B2 Piston Replacement SUCCESS W123
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