I am trying to unlock 6th gear in my 07 C5500 Topkick. I cant find any parameter that "activates" it, but 6th gear is in all the tables and from the looks of the file it should shift into 6th. I know for certain that I have the correct transmission from examining the valve body.

Can someone share an 08-09 C4500/C5500 Topkick/Kodiak 6psd transmission file with me please? Or point me in the right direction for unlocking 6th?