Hi all,

Thi is my first post to the group, so allow me to first say hello. I'm Mike from the UK, have owned an E320 estate for a year, and its been great.

Spring greetings to you all.

I have been busy rifling through your old posts in the last few weeks in the hope of finding an answer to the problem of vibration only under torque lockup on the 722.6 trans.

I have still not found the answer, but I have no codes reported from the TCU, and the car otherwise drives ok.

The vibration is an aweful sound, heard in all 3 lockup gears and the rev needle DOES seem to sit around the 1500rpm mark, as others have noticed.

I have also noticed that along a flat road, in cruise, at around 35-40 mph, the lock up slip is constantly changing, causing the rpm needle to fluctuate +/- 100rpm.

Most annoying.

It may be that I need a new TCU, but I'm very aware that you can't "try before you buy" and I do not want to spend out on something that might not help. Although other posts SEEM to point to this being the answer.

The other posts I've found relating to this problem seem to end prematurely, with no fix reported. That either means they gave up and sold the car, or they couldnt talk about the cost as it bought them to tears.

I would be most grateful to any kind soul offering wise words on this before I get my leg lifted by an MB dealer.

Thanks in advance, and best wishes,

Mike Freeman
UK