I had the transmission rebuilt. It has extra clutch packs in the 4/5/6 drum. When the vehicle is cold it takes its time shifting from 3 to 4. Within a few minutes though it seems like on partial throttle shifts it just engages 4th way too quick with a little clunk. I looked at the tune and the temperature parameters to see if the pressures or anything change with the warming transmission. Nothing changed. So is this mechanical or can it be fixed with something in the tune? Thanks