Welcome to the stovebolt
Good luck getting info on this I had been at it for two years
If you’re going to restore it I will help you all that I can
PM me and I can send you more.

What is it GMC or Chevy??
If it is a Chevy it is a Chevrolet model #3742 3/4ton. Is a 125 1/4 wheelbase.
Or the 1ton is a model # 3942 with a 137” wheelbase forward control chassis
If it is a GMC it is a PM 152-

The Grumman Olson Kurb Side is the Alloy Body and it came in the Comet Clipper and Peak Loaded.
all are G.V.W. Standard Tires6200 GVW 7000 lbs Maximum Tires


(Comet) T3-8 is a 104” wheelbase 8 ft. 1080 LB. Alloy Body 1 1/4 ton payload capacity 300 cu. Ft.

(Clipper)T3-10 Is a 10 ft. 1275 LB Alloy Body 1 1/4 ton payload capacity on a 125” wheelbase 360 cu ft. payload?

(Peak Loaded)T3-12 is a is a 125” wheelbase 12 ft. 1470 LB. Alloy Body 1 1/4 ton payload capacity 440 cu. Ft.

I have a 1952 GMC Grumman Olson Kurb Side.
It is the Comet T3-8

Grumman stepvan or a DUBL-DUTI or a
GMC DUBL-DUTI Grumman
Morgan Olson Step Van
(Formerly Grumman Olson
Milk truck bread truck route van

Maxx


52 GMC Grumman Olson Kurb Side stepvan T3-8(Comet)69 GMC 1/2-ton