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I have noticed the issue with my 2019 F350 as well. I have a banks derringer and 4" exhaust at the top of the hill it stays in 5th for quite a while. I haven't tried disabling tow/haul, I will if it happens again because it can be irritating. I have noticed if i take the cruise off when approaching a hill and do not put my foot in it I can keep it in 6th gear for the most part, that keeps the tranny temp down. But i have not had that get above 215 degrees so far. So I think I am in good shape. Thanks for the info!
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2021 Montana 3761FL, 9 LIFPO4 batteries & 1700 watts of panels w/ Multiplus II 3K inverter and 30amp DC to DC charger from truck. 8k Dexter axles w/ Kodiak disc brakes.
2019 6.7 diesel F350 DRW with Banks derringer and 4"exhaust, airlift bags, 25k B & W Companion hitch, 45 gal. aux. diesel tank and 14k Winch, just in case!
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