'05 CDI transmission "shudder" - PeachParts Mercedes-Benz Forum

ROLLGUY · #1 02-15-2017, 08:46 PM

Quote:

Originally Posted by 97 SL320

Do a search for RSN ( Rumble Strip Noise ) on some sprinter sites. The torque converter clutch may be dragging / being too aggressive causing a slip - stick - torsional vibration ( like being in too high of a gear in a standard trans )

The TCC on the 722.6 is modulated from 0 to about 98% lockup. When you are harder on the throttle the TCC isn't engaged as much so you don't feel the shudder.

A fix is to replace the TC with a spring release clutch. Changing fluid might not fix this. About the only additive I'd try is a friction modifier ( like posi traction additive ) called " Shudder Fixx " , it is made by " Lubeguard " Instant Shudder Fixx it is about $ 7 a tube. I've used this on many non MB cars and it works, as long as the problem is a TC shudder not a failing trans.

You are right on, and agree with Marc at SVMT. I changed the fluid today, and man was it gorse! I think it had never been changed. It was dark greenish brown. Using compressed air through the cooler line fitting, I was able to get 6.5-7 qts. out. There was just a very little grey fuzz on the magnet, so that is good. As suggested by Marc, I used cheap fluid and a new filter this time, and will change it again using synthetic. On the test drive, I noticed that almost all the shudder is gone. I would say about 80 percent, whereas it was horrible before (almost not derivable). There is just a mild shudder after the 2-3 & 3-4 shift. I am hoping another flush will get rid of the shudder completely. Worst case is I will try the shudder fix. Thanks, Rich

kestreltom · #2 02-16-2017, 12:17 PM

Quote:

Originally Posted by ROLLGUY

... As suggested by Marc, I used cheap fluid and a new filter this time,...

Hey rollguy, what cheap tranny fluid did you use? I am planning to do the same thing to flush the trans on my (also) newly aquired '06 CDI.

While performing the 2nd fluid change, you might want to consider dropping the valve body and replacing the conductor plate. There is plenty online about this issue...