140-150 normal towing in 4th gear with the 5-speed trans. I didn't think I've seen above 180. Honestly I find recall seeing over 170. Very low.What do you typically see your trans temp get to? I took a recent trip with about 4,000 lbs, and had some pretty long hills; I was getting up just over 200 degrees. Granted, it was a pretty cool day at around 60 outside.
I monitor torque converter temps and trans temps. The torque converter temps will climb fast when it's not locked, then the trans temps will follow. But they drop fast too.
Your "just over 200" seems about right to me. You're probably pulling much longer hills than me. And by the way, I'm not an expert on any of this but it interests me.