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...
Forum Discussion
I tow 65-70mph usually and use Tow/haul and M5 to lock out 6th gear. At 65mpg, 6th gear would be about 1700rpm and not enough power. 5th gear is 2200rpm @ 65mph, which seems low too but it holds on flats and overpasses. My last 4-spd truck towed was happy in 3rd gear at 2800rpm. I get 7-9mpg at my speeds.
