For everyone with Trans issues - tried cleaning the valve assembly?

[flatlander]

Originally Posted by CharlieHustleX5

Valve bodies are known to be the cause of many BMW transmissions faults, but dealerships cant diagnose that kind of stuff. If one were to DIY a valve body removal and cleaning, valve body gaskets and seals are not available through the dealer and almost exclusively found at transmission shops. Without the manual specific to the transmission being worked on, many key things could be left out when assembling or disassembling a valve body. Also, what would be used to clean out the passageways? Brake cleaner? Sometimes its not the greatest idea to use such a cleaner.

Its just a littlle bit more involved to service a valve body. I guess if some were interested, I could post a DIY on a valve body removal for the 5L40E transmission.

Is trans valve body cleaning part of a standard transmission service, or would one have to request this specific work?

The were many little balls and springs in the valve body and if you don't take these tings apart in the right way I can see how you would lose track of them easily. Sliding the middle plate out rather than lifting it straight off helped to keep all the things in place.