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Originally Posted by Stevels
...a vacuum issue? This is prefereable to expensive, catastrophic transmission failure.
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You bet! My late 300SDL transmission was still going at 264k+ so they can be long-lived.
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...Are there any threads that detail what I should do?
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Oh, only about 1 million!

This article below is good general reading on how M-B transmissions are controlled.
http://www.continentalimports.com/ser_ic20242.html
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Originally Posted by Stevels
...I will get a vacuum gauge, if anyone can reccomend one...
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While any vacuum gauge will work, the "MityVac" also has a hand pump and will function as a vacuum source. This can be invaluable to check leak-down of suspected items, such as vacuum modulator diaphragm on the transmission.