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I've never spent that long in 1st towing (5 miles), but the TC is unlocked while in 1st, so it's gonna get hot IMO...
I do know that I got over 210* while I was in 2nd gear with the TC unlocked and that was within a couple of miles. This was only a 5-6% grade and I was towing a #5000 TT.
I've gotten it up to 210* backing the trailer up a slight incline before...
I've got this big hill in my neighborhood that's about a mile long and I've taken my TT up it twice. Unfortunately, both times were before I got my gauges, so I don't know what the temps were, but the first time, I put the gear shift into 2nd and the TC stayed locked, so it bogged me down pretty good.. I had my foot to the floor and I was only going around 20 mph at the top! The second time I let it go into first, and while I didn't have the pedal to the floor, I was still only going 25 mph with the rpms up around 4000!
I've not taken that route since!
Good luck,
Mitch
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