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 have always liked the low reverse gear on both of our 3500 Allison trucks when backing up to park the alpenlite. I wonder if any body made their 5 sp into a 6 speed. My friend did on his 2001 3500 8.1 dually.
chevman
chevman
