Hi

I looked at the picture of your truck, and in my most humble opinion it "IS" a 450 series which makes it a 3 ton. The wheels on it are Motor Wheel six lug, hub pilot w/compression lugs and depending on tire size (8.25X20 or 9.00X20) either 7 or 7.5 X 20, 2 piece rims, w/outside locking ring (Not Widow makers).

The engine (if Gas) is a 270 with dome pistons and hemi-head. And either a Holly 660A1, 2 barrel or a Stromberg WW 2 barrel.

It could have Hydro-Vac brakes, Air Pack brakes (air over hydraulic) or straight Air Brakes.

I have been eye balling a 1952 GMC tanker myself and a 51 GMC 400 series tow truck, I already own (2)1952, 454-30 GMC's (302CID).

Is the ID plate still on the inside of the glove box door?

Your going to have lots of fun and a few headaches, in the end worth everyone.

More pictures please...:>)

Dance like no one is watching,
Sing like no one is listening,
Love like you've never been hurt.

1948 GMC FC101 1/2t Pickup w/270 and SM420
1948 GMC FC253 1t Factory 80"x9' Flatbed Dually
1948 Chevy COE 2 Ton 8'x15' Flatbed
1950 GMC 354-24 2 Ton 8'X12' Flatbed w/Dump Hoist
1953 GMC 454-30 3 Ton 8'x14' Flatbed w/Dump Hoist
1953 GMC 454-30 3 Ton Cab and Chassis
1942 Clarkator 6 MILL-44 Heavy Aircraft Tug
1942 Ford (9N) Moto Tug with 1/2 yard Loader
1947 Oliver OC3 HG-42 Tract-Crawler Bull Dozier w/6' Blade