Originally Posted by Clockwork

SO I too just had my ZF6HP26 valve body (separator plate B052) replaced by a new unit from RevMaxconverters.com and it too has made my tranny new. I have owned this x5 for 10 years now and It's never shifted this smoothly. I barely notice it moving about honestly. SO GLAD I went this route.
Perhaps the upgraded aluminum, instead of plastic bits, will help but I don't care as long as it lasts. Expensive but built properly and has 1 year warranty as opposed to me buying the ZF kit and repairing and if I had screwed up something badly, I could be back to square one repairing again. Buying this and returning my core (free, since they include a UPS core return sticker) was smarter and got my x5 back on road faster.