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
I know these 10 speed transmissions are becoming more common. Of course, lots of 8 speeds out as well. I've only had a 6 speed and am definitely aware of every shift. To those of you driving these 8 and 10 speeds, do you ever find it is just always shifting to find the right gear? Are you as aware of each shift like with the older transmissions?
