The GMC CCKW

Any idea what type or size engine this truck used? How many were made? I'm guessing fewer than the similar Autocars.

According to Vanderveen the M425 and M426 used the IHC RED-450-D (Red Diamond) 6 cyl 451cu in engine giving 124bhp @ 2600 rpm. Unfortunately he makes no mention of production no's.

Thanks for the response. I am on the road and don't have any of my reference material with me. Thanks again.