Originally Posted by crystalworks

Is that all you did from the original post? Pan/filter/fluid change? I'm not sure which tranny is in the 2002 4.4i. 5hp24 I think? If all that was done was the above, you are probably having pressure issues. As you said the fluid is thin, the ZF stuff is very thin. If you did not replace the valve body seals at the minimum, it's probably not holding pressure.

Now, what you can try... and I have not done this personally, so I am just passing on info. Try using the Valvoline multi vehicle ATF. It is thicker and I know of a YouTuber (I know, I know) who only recommends that if just doing a pan and fluid change. It is thicker and will help with the old seals. I was going to use this, but the trans service kit I got came with Liqui Moly so I'll be using that instead. The YouTuber in question (Nathan's BMW Workshop) seems very knowledgeable, but it is just that, advice. He said it's brought back almost every trans he's put it in from rough shifts and other behavior. It's a cheap thing to try at any rate...

This is the stuff: