wasn't there a big discussion In here about the 2005-2007 truck pcm being swapped to 2 bar OS and disabling the maf causing a no wot shift issue
this is a 4l65e trans. I went single turbo and went to the 2 bar os and since then the truck will not wot shift if shifts fine other than tht

if someone remembers the discussion please send the link or please fill me in lol

I have a post in the trans tuning forum here if anyone wants to chime in