Well here it is in black and white, I just got a factory brochure from GMC 1937 and its a 4 and 5 ton range brochure , I got it on ebay from ours friends in Canada, This is what it says.... The F-33(4 ton) were 6 lugs and the F-33HD(5tons) were 10 lugs, they came with a 286.4ci valve in head type, 3 5/8 bore and a 4 5/8 stroke, 90hp at 2600rpm and 205ft.lbs. at 1000-1800rpm. the F-33 did not have radius rods on the rear axle but the F-33HD did. this truck has the radius rods, when I was in the cab I shifted the shifter and I think its a 5 speed trans, the brochure says they had a std. 4 speed and a optional 5 speed underdrive and a 5 speed overdrive, on the F-33 they had gear ratio of 6.50 to 1(std.)or a 5.625 to 1 and a 7.20 to 1 (optional)and the F-33HD had 6.43 to 1 (std.) and a 7.16 to 1 (optional).so what I have is a 5 ton with a 286 engine and from the pictures in the brochure its a 1937 truck. I want to thank all of you guy for your input and help on this truck, and my brother will send more of the pictures on Monday. Dan
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