Explain me all the symptoms you've had with your 722.6 transmission. Im sure mine is still ok but we'll see.

The car is not driven too much...maybe thats an issue?

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99 C43
98 S420
99 C230K
01 C240

Mine never did what you're describing. Rather it worked perfectly for 120,000 miles (fluid changed at 75k) and then died. I was moving at speed in fifth gear and pushed the accelerator to get fourth. It slammed into fourth and then stayed there the rest of my trip (limp home mode). Parked and came back later still in limp home mode but now only second gear. The tow was a couple hundred bucks plus (this is a guess) about $1,200 for my indie to replace (I think) the valve body and control module. It's worked fine since then.

From what I've been told you've done the right thing by changing the fluid. I'm not sure, and perhaps this is the real question here, but until it breaks, there's nothing else for you to do. Is yours under dealer-backed warranty?

You don't by chance feel like mailing me your MAS so I can test mine against a known good one do you?

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Michael

1988 300 SL (5 Speed)
1994 E320 Wagon
1997 C230

Nope nothing else I can do. Codes that came up when they did the fluid was "torque converter lock-up" but they said this wasnt major and something probably triggered it once and never again so it stores it. I dont know.

The MAS I just replaced...with a new one. I dont have another one.

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99 C43
98 S420
99 C230K
01 C240

http://www.transmissionspecialty.com/parts/parts/68942-01.htm

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Michael

1988 300 SL (5 Speed)
1994 E320 Wagon
1997 C230

Yup looks like this will in time have to be replaced. I can still let it go for awhile though.

Thanks!

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99 C43
98 S420
99 C230K
01 C240