I had the same question/worry when first pulling our fifth wheel, with our new f350, up a long grade with outside temp reaching 110. Asked the wife to grab the manual and try and find info on what to watch for, as far as a redline temp. Nothing. She grabbed her iPad and did some searching and found that at a set temp an auxiliary fan kicks in to help cool the tranny. I watched the temp rise and sure enough, could faintly hear the fan come on and watched as the temp declined. I have no idea what that trigger temp is, but am relieved that the higher temps have been engineered for. Now I can worry about something else.
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"I might be movin' to Montana soon..."
2020 Outdoors RV Glacier Peak Titanium
2013 Eagle 29.5RKS (traded in)
2013 Ford 6.7L diesel F350
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