Powertrain and Isuzu, and has gone through numerous iterations through the years. Duramax engines are paired with a heavy-duty automatic transmission from GM's Allison division. See also Chevrolet small-block engine Chevrolet big-block engine LS based GM small-block engine Duramax V8 engine Buick V8 engine Cadillac V8 engine Oldsmobile V8 engine Pontiac V8 engine Holden V8 engine GMC straight-6 engine GMC V6 engine List of GM engines References V8 V8 engines