2013 Ram 1500 restored to stock, now transmission issues

[gilberjm]

Hello. I have a 2013 Ram 1500 QC 4x4 HEMI 6 speed and about 10,800 miles. I recently restored my truck back to stock and unmarked the intune. Today I realized the 2-3 shift was very odd and not what I remembered for stock form. It isn't shifting until ~40 mph. Before 40 it will just stay in 2nd as if I had it in manual mode. The temps here are also in the -10's which I'm hoping is the issue but it has never done this before. Any help appreciated thanks.

[mikel]

I would likely attribute that to the cold weather...everything in the trans is based on fluid temps...

[gilberjm]

Thanks mike. That's the answer I was looking for. It just so happened I took the tune out before the coldest day of the year.

[fitter1]

How come you took the tuner out?
Same truck as you, and I'm not sure if I'm satisfied with this thing yet