Looks like you got a btie off subect, the question: "did GMC make a semi tractor in the 60-66 body style", short awnser, Yes.
the long awnser: they were built in every style of GMC from the 1960s, they were built from the
105" Conventional Trucks that looked like there little brother the pickups. but there is also the
90" B-model , the
72" steel tilt cab , and lets not forget the good old
Aluminum "Tilt-Cab Cruiser" commonly called the "Crackerbox" by truck fans , which was the pre runner to the GMC Astro.
