2010 LX570 TRANSMISSION ISSUE

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Question on trans temps. Got about 500 miles on the new trans. I noticed the convertor temp seems higher than my old trans. Truck fully warmed up 32 degrees outside I saw 240 at the convertor pulling a slight hill around 45 mph. Towing light trailer around 900 pounds. Trans temps around 210 at that point. Convertor was unlocked up the grade. Once the convertor locked back up the temp came down to within 1 degree of the trans temp 1
mechanic states fluid level was properly set. Trans is shifting and performing like a dream. Just a little alarmed. What's going to happen in the summer towing my 4000 pound boat?
 
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