2012 2500HD CC SB with 6.0L and 3.73 ratio
Hi all, Took our first long trip with my newer tow vehicle. I went from a 2006 chevy Duramax to a 2012 6.0L gas with the 3.73 ratio. Now I fully understood there would be a difference due to it b...
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if towing with tow/haul on 6th gear upshift won't occur until 68MPH. Run it up to 68-70, let it shift and then settle in at 65.
