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Old 08-15-2005, 05:18 PM
Eiknujrac's Avatar
Car Junkie
Join Date: Oct 2003
Posts: 99
Early 722.6 Experts or People who have had the problem.

I have a 98 C280 with the infamous 5 speed electronic tranny. I bought it at 86k WIth no records of transmission service or repair. It is now at 90k, and the other day I was pulling up to a stop sign (didnt come to a complete stop), and gave it throttle to accelerate. I'm assuming it was downshifting from 2 to 1, but it gave me a huge CLUNK like I had hit a pothole or something. Is this a standard sign of the 722.6 going bad or is this something else? It seems to only happen on the 2 to 1 downshift, and it has only happened 2 or 3 times in the past 2 weeks. I have no other signs of tranny wear, just this.

Does anyone know how many miles (rough estimate) I have left before I have to replace the tranny (assuming this is a tell-tale sign)? I baby my car and never push it hard unless it is necessary (merging etc.). I'm just asking because I have a 6 hour drive on wednesday that I have to make (flight isn't possible, i'm going to be carrying a lot of boxes/luggage) and I don't know if this is serious enoguh to the point where the car won't make it.

THanks in advance!

I love my cars to death but my wallet sure doesn't.
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Old 08-15-2005, 08:47 PM
Eiknujrac's Avatar
Car Junkie
Join Date: Oct 2003
Posts: 99
Ah the trip got bumped to tommorow morning... Anyone?
I love my cars to death but my wallet sure doesn't.
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Old 08-15-2005, 09:03 PM
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Join Date: Jul 2004
Location: NC
Posts: 1,140
lol, search for posts under my username and 722.6. I'm at 92k on a 97, which is luckily under warranty. Does it slam into gears when upshifting, or is this slippage before even shifting into gear? Either way, there are a lot of variables. Could be total replacement, TCM, conductor place, valve body - there were a LOT of updates for this trans. The very least I would do is take it to a reputable indie and get the codes read. At 90k, if nothing else is wrong, I would absolutely do a fluid and filter change.
former: 83 300D, 97 C230, 93 400E

current: 08 C300 Luxury , 92 500SL
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Old 08-17-2005, 09:01 PM
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Join Date: Feb 2002
Location: east coast
Posts: 1,255
For many manufacturers the early five speeds have a tendency to hit first gear hard.

Do a search, and think about maintenance of the trans; fluid, filter maybe a magnet.
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Old 08-18-2005, 09:21 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153

Since the trans is computer controlled & ADAPTATION information is available, have the trans ECU scanned for codes & see what long term adaptation torque figures are!

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