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W211 722.6 lock up speed? experts only.

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I think I've sussed out why my box doesn't feel right. Its took me a while to diagnose strange jerky gear changes and poor acceleration but I think the TC is locking up too early. 16 mph to be precise even in first gear.

My old W210 didn't lock up at low speeds like this (same box?).
You could put your foot down and the revs would increase and you would hear the turbo spool.

But on this W211 once locked up (16 MPH) acceleration is slow because the engine can't rev freely. also I noticed that once over 16 mph if I let my foot off the revs do not drop in the slightest in any gear.

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