I have a 1981 300D that needs a new modulater valve. I have the valve, red one, but I can't find a procedure for its correct adustment. I have the Mercedes manual on CD(bought it from this site), but it seems to lack anything on the transmission except for fluid changing. I have read elsewhere that its easy to do with a vacuum gauge. But don't know the spec's. Help!

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Mark B

81 300D