What should the operating temperature be on a 2008 chevy automatic transmission

160 to 180 degrees

That is great. No worries there! But why did you ask?? Does the info. center on truck show any problems?

No it didn't show any problem. I fueled up and when I left the pump all was fine I stopped before exiting the station, when I pulled out onto the HWY the trans slipped for a moment and then engaged really hard. I checked the trans temp and it was at 183 degrees, that was yesterday and it hasn't happened again.

Thanks, I appreciate the information.

Have the ECM (computer) scan tested to find out WHY light is on!