C63 2010, 722.9 with red oil.
Not found a single one with the same problem as me.
at first, car would only drive forward in neutral, no reverse. Slipping at start like stuck in high gear.
filter and oil change, same problem. Got mad and just hit it in neutral gear (while moving forward) and around 180km/h it came a bang, and neutral was neutral again. Need to restart the car, then it had drive and reverse as normal, no slipping.
after around 150km it would start to not wanting to accelerate in gears higher than 3, would shift all gears, but had to throttle it gently in 4th and above.
did an oilchange again and filter, after that i have no drive and no reverse, not in neutral either.
the trans have never slipped before.
just got a new tcm but have not got it activated yet, but should it just be in limp mode with it not activated?
Starting to lose the hope and have no more to go on than to pull the trans off soon.
have had alot of different codes, but that should just put it in limp mode.
thanks for all the tips i can get.

Are you saying that it drives when indicating neutral ? And won't drive in drive or reverse ? How many miles on it? What was the condition of the fluid and filter that came out? Lots of clutch debris? Burnt fluid? It sounds most likely like the clutch packs are worn beyond the limit of the trans but hard to say. More than likely sounds like a rebuild is in your future

It did a short while at first, like a gear was stuck.
It was not alot of shavings in the pan, almost nothing. The oil and filter was last changed 2000km ago.
The car has 14k/km on It, and the trans felt like it was in good condition before It got stuck. Have blown a few transmissions before on other cars, but It always showd a sign before going out the door atlest.

The car only has 14,000 kms?

Put a 0 behind that, so used to say it in mil, not km 😅