Thanks for the reply. I replaced the aux cooler with a lager one and installed an inline booster pump. Nothing really changed. I checked the dipstick for level, and noticed in the process that the dipstick and fluid both weren’t very hot to the touch which made me think it could be a false...
I recently placed a 1994 4L80E into a 2002 Avalanche 2500. The cooler lines had to be shortened to accommodate the new transmission, as well as the shifter shaft etc. Now the new trans keeps running hot after an hour or so. I want to retrace my steps and make sure I have things hooked up...