I'd love to help but, I'm not a tech. I strongly recommend you wait for one of the techs to read this one. Transmissions are expensive!!! I sometimes have a little abrupt 3-4 shift and I tried to adjust it after reading a post on a similar situation. The car shifted extremely hard after!!! I took it to the dealer and told them I'm an idiot and they turned a few screws and done!!! I left the car running!!! (Mercedes-Benz of London, Ontario, Canada = friendly and honest!!!)

I'd love to hear how it comes out since I also have a 2.6
How does your car shift now?

Best of luck and be careful!!!!

Mike McKinney

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1989 300CE - 269,000 km
1994 SL600 - 59,000 km