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Your service dept is right , safe temp should be right around 150 to 160 . Usually the transmission wile pulling a load will run 25 to 30 degrees cooler then the engine temp.
Was this before or after the replaced the converter was replaced.
Your first post stated your readings where right at 117 degrees and that would be fine . You second post says it was 97 C. Which converts to over 200 degrees which is to hot. Which ones are the actual readings your getting. The transmission in most cases will run 20 to 30 degrees cooler then the engine temp.
Okay I thought you where talking in degrees on your first post. Even at 97C that to hot meanig its over 200 degrees and 117 C would be extremely hot so the answer it yes its in the danger Zone. The transmission properly cooling will usually never exceed engine temp.
That seem extreme to me but its possiable depending on out side temp as well as the weight of the trailer. Have you consider adding an extra external transmission oil cooler. The cooler you can keep the transmission the longer it will last.
Well I am out of ideas so I will open the post back up for you and perhaps someone else has something new to offer.