Awesome!

I have had 3 of these with one remaining as a road tractor to restore with a 280 Cummins, 13 spd and an air ride tag axle. As 1952 COE said I am pretty positive it is a 4000 series. The hubs are probably for 10.00 x 20 wheels. The bigger engine road tractors used 22's but the mustang gas engine dump truck I had used 20's. The front bumper looks original. The goofy looking bent steel above the headlights with the turn signals mounted to them are also original.
I have never found out for sure when they started making this model, but my guess is the late '50's as mine is a '60 and am guessing by the mid to late 60's they had a tilting fiberglass hood and only used the Autocar cab. The cab on this is a White cab (love the rear window) and was used on the previous Mustangs, model WC. In the 4000 series at some point they were also available with the wider Autocar cab, which had a two piece windshield. On the gas engine in the one I had, it had a tag on the driver's side that said Diamond Reo, this was during the time when along with Autocar, White also owned Reo.
I may have some parts you can use. If it is a gas engine, I know I have the correct grill for it but I don't believe I have a rad any more. I think I also have mirror brkts and maybe some guages too. I think I have some extras of the hood and grill emblems.
I will send you an email with some pics of mine and a link to the White pics at Hanks Truck Pics . Com, great place for old truck pics of all makes and models.
Let us know "when" you get it!!
