I know Brockway well. That last curve after the passing lane ends is steep until you hit the summit. It could be the difference between the Monty and your 4k heavier rig slowing you down. I usually use manually when I want to force the tranny to shift. If you get after market tuning, many tuners can fix the factory issues in all platforms.
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2013 F350 Lariat Ultimate CC LB
2019 3790RD
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