727 Transmission engine size?

65 Dartman said
and there was at least one varient made for a Maserati!

According to this joint here,

mail jeep transmission type - JeepForum.com

The US Postal "Jeeps" used em behind GM and Renault engines

DJ-5G=Torqueflite 904 w/121ci Renault
DJ-5L= Torqueflite 904 w/151ci GM