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#1
11-30-2016, 03:52 PM
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My 6hp26 experience
As you can see on my signature I have two X5s with 6hp26 tranny.
The 4.4 has the well known 2-1 bang problem when accelerating before going to a full stop and a harsh up shift 1-2 in cold mornings. Otherwise the transmission is smooth like new. The 4.8is got the same problems plus a harsh shift 2-3 or 3-4 (not sure) when accelerating fast from a traffic light. In normal driving this problem is not happening. The harsh up-shift 2-3/3-4 felt like the clutches were braking for a split of a second. I don't know how to describe it well. My wife wouldn't feel any of these on the 4.8 but it bothered me so I had to do something. Over the last two years, I did the firmware update, 4L oil change and filter but it didn't feel like it fixed anything or not significant. Last year, I changed the square and cylinder VB rubber seals and again the tranny was not as smooth as some of you found after these changes. A week ago I changed the solenoids (US $260.00) and so far I can say that the transmission feels like new. The procedure is pretty straight forward and is well documented on internet. Everything about your ZF 6HP26, 6HP19, 6HP28 transmission issues | BMW LOGIC7 https://www.youtube.com/watch?v=zwjvxRZyvWM&t=40s Re-learning procedure after the adaptation reset Here is the proof  
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 4.8is 2004 imola red 4.8is 2005 Black on Black - DINAN/2 sold 4.4 2004 X5 2003 330xi 2008 328xi - sold 4.4 2000 X5 - sold Last edited by fmugur; 01-19-2017 at 01:23 PM. 
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