So I went to tune a vehicle for a customer. He has a 5.3/4l60e. Turns out the pcm is 07 6.0 express van 4l80e. Would start off in 2nd gear then downshift into 1st then no 3rd or 4th. Kinda like the same a 4l80e swap acts like before the segment swap. I changed just the type of transmission Under GENERAL Trans Type to 4l60e. It shifted fine for couple miles then defaulted to max line pressure and started holding gears for longer period of time and never would shift wide open throttle on 1-2 shift but would 2-3 shift.
So I downloaded every Chevy/GMC 07 and 06 files out of Tune Repository to try and segment swap back to 4l60e but have not found a match for this files OS. Any Ideas or help would be appreciated.
Would like to segment swap then inspect the transmission connector to make sure its pinned for 5.3 and not a 6.0/4l80e harness. Harness had been modified and all wrapped up for this show truck so I don't see 2 speed sensors like 4l80e has.