Finally got around to swapping OEM stats (127k miles) for some more Acdelco thermostats from rock auto. Not too bad, maybe a 30min job lol.
Been needing it for bout a yr. The other day I went to work it was only 50 out, truck never got up to 170 even after near 30min drive. This afternoon just a few miles leaving work (also about 50degrees out) it was up to 185 in no time. This is a first in I can't remember when, except towing or hammering down interstate.