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
Cummins12V98 wrote:
NOT dissing the trans but it's a GM built trans with an Allison "LABEL"...
Then why publish this? It has been this way since 2007.
