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Discussion Starter #1 (Edited)
Hello, I've got 2003 745i with 70k miles and it has some problems with transmission. first one hard downshift from fifth to fourth gear, every time, sometimes strong, sometimes just little bit. Also sometimes it changes gears not so smooth. Another noticeable problem is, when I'm driving fast and suddenly stop the car, it's like something under the car from rear side hits and there's clunk and it seems like I've got rear ended, but this happens not while shifting gears and I think it may be guibo joint fault. I have checked transmission oil level and it was ok and there are no any tranny errors, some say it's mechatronic problem but no one can tell me for sure. Did anyone had issues like this and how to fix it?
 

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Discussion Starter #2
I replaced guibo joint and some problems have gone, but main issue, hard downshift from 5th to 4th gear still remained and maybe someone had same problem and can give me some advice.
 

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Discussion Starter #5
Yes guibo joint caused that clunk and after I replaced it there's no clunk anymore, but guibo could not do anything with hardshiftng.
 

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It's possible that the two transmission mounts, have disintegrated to the point where it's metal to metal. Or you may have further problems with the driveshaft. Here's a page that explains things.

http://www.driveshaftspecialist.com/Import html/BMW.html

Here's a couple of good resources for the transmission. Just because you're not throwing codes doesn't mean you don't have a problem.

http://www.bimmerfest.com/forums/attachment.php?attachmentid=256957&d=1291335701

http://www.bimmerfest.com/forums/attachment.php?attachmentid=558826&d=1460520414

http://www.bimmerfest.com/forums/attachment.php?attachmentid=558825&d=1460520414
 
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