2020 GMC/Chevrolet Diesel Engine
“The optional engine remains the largely carryover 6.6-liter Duramax V-8 turbo-diesel—445 horses and 910 lb-ft—but is now mated to a 10-speed version of the excellent Allison automatic gearbox, up fro...
Forum Discussion
If these 10 spds are like the 8 sp auto trans in MB's. At least the ones My wife has brought home as loaner for her ML, they do not always start in 1st gear. I've only found them using first when on a grade in the min 10% grade range. The hill I know it is used, might be steeper, more in the mid teen range.
With that said, a 12% grade in the tow test, is a pretty minor grade! Altho 1.5x steeper than a max on an Interstate.....still not that steep.
Marty
With that said, a 12% grade in the tow test, is a pretty minor grade! Altho 1.5x steeper than a max on an Interstate.....still not that steep.
Marty
