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Old 12-08-2002, 04:26 PM
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My 77 450sl did the same thing. Turned out to be the reverse band servo piston seal. It is located behind a round cover on the left hand side of the XMSN. All I did was pop the retaining spring out and the cover along with the piston popped out. You may want to drain fluid first or you'll get a good bath. Just remove the seal if it's bad and install a new one on the piston(It's just a rubber ring and reinstall. You should be able to get the seal from any dealer fairly inexpensively.

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