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Old 03-27-2011, 08:09 PM
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Join Date: Apr 2006
Posts: 672
Trying to figure Transmission Shift Issue... Help?

Car:
1990 Mercedes 190E, 2.6, with 722.4(I think), and 89k miles.

Issue:
Odd shift from 2/3.
Only occurs when it fully warmed up.
On the shift, it makes a "groan" or grumble. There maybe some vibration, but you hear it more than feel it I think. It feels like it slips... but that just what I sense... there is no slur or slip based on engine speed.
It's only on a medium throttle(1/3 to 2/3). Light throttle you don't feel it, or hear it.
Full or that last 1/3 throttle, it shifts firm and fine.

Work done so far:
Fluid was clean and clear, but I changed it, and filter.
No difference.
Replaced the front flex disc, as it had some wear, and checked the center support and rear flex, and they looked and felt fine.
No difference.
K1 shift kit added.
No difference.

This car is so nice, and I plan to pass it on to my daughter, so I want it right.
I just need to know what it could be.
A Vacuum issue, or modulator issue?

If I have to pull the trans and replace a band or something, I will.

Asking for ideas, suggestions?
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2009 Mercedes ML320 Bluetec
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