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Message: <blockquote data-quote="rpmnut" data-source="post: 468320" data-attributes="member: 20757">Hey bimmerholic - there were no error messages on the OBD relating to the gearbox. That was what baffled the BMW guys in the first place. They scanned the ECU and not a single error code appeared. But something was obviously still not right. My guess is that not all machanical problems can be traced using error codes. My own suspicion is the lock up clutch in the g/b. I read on the BMW USA forums that the lock up clutch can sometimes start to have problems in engaging/disengaging. If the clutch doesn't engage at all, an error message will appear. But what I felt was happening here was that the lock up clutch was disengaging late, causing the jerk - but because it actually did disengage, no error messages appeared. I could be wrong though...LOL. This is me playing witch doctor lah! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin    :D" loading="lazy" data-shortname=":D" />As for th eATF fluid, I flushed and replaced my ATF, filters..etc when the problem first started, hoping that it would solve the issue, but even after that job, the gearbox was still jerking on downshift.</blockquote>