0x5A=90For what it's worth, on mine 0x21 0x5c returned:
7E9 07 61 5C 0D D0 00 50 5A
That was with the engine off, however.
Assuming it isn't 40°C/104°F in Colorado, was that after it cooled down for a few hours? It looks like a reasonable value if that was the case. I bet it matches the other trans temp pid(if you put it in drive so the other one works).