Spanky, I finally went out to my land to look at the '52 GMC. It has no series designation on the hood, but the ID plate has it rated at 19,000 GVW. It may have been military. I haven't seen another one with a single axle and 10 bolt wheels front and rear. It has another plate inside the glove box with axle and tranny info (like CLARK trans.) It also has a 302. Did you have reach a certain GVW to get the 302?
Terry

Terry Wofford
'52 GMC 3 1/2 Ton
'51 GMC 2 1/2 Ton
'53 GMC 1 1/2 Ton
'53 Chevy 2Ton
"If it ain't broke, well give me the keys and I'll be right back!"