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A lot depends on the year of your truck and the weight you are pulling. Pulling 16000# and in tow haul, my 2016 3500 Duramax would change into 6th at 67mph. This became the speed I set cruise. My 2018 has more power and changes at a lower speed, but I continue to set cruise at 67.
You can force an earlier change into 6th by momentarily dropping out of cruise.
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2018 GMC Denali 3500 Duramax Dually
2019 Montana 3791RD
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