Hi guys, looking for some help with this truck. It's a 2013 LML that had a tune on already, but the owner wanted me to retune it. I got it running like he wants, but now the truck won't downshift out of 6th gear above about 50 or so. I thought, no biggie, I'll tweak the shift tables. Wrong. As far as I can tell, none of the downshift speed tables make the slightest difference.
I did try flashing the ECM back to stock, and it would downshift up to about 60 or so, but above that it's the same.
The tune on the truck originally did NOT have this problem. What am I doing wrong?