I got my old Tacoma to light up the A/T Temp light when I was climbing up Hayden Pass. I was in 4Hi and climbing up steep, loose shale on the west side. Lots of slipping... I parked for 10 minutes, then put it in 4LO and was fine the rest of the way.
I always wondered how hot that was....now I know.
1976 FJ40 - green and mostly stock
1996 FZJ80 - not so stock