The Stovebolt Site Forums The Shop Area General Truck Talk What year is it?

I purchased a 1947 GMC one ton stake bed. The brake drums leak when you apply the brakes. I can't figure out what rearend I have. The truck is in good condition but the rearend looks alot newer than the rest of the truck. The brake drums don't look a thing like the shop manual. The axle housing has two slots 180 deg. from each other. Can anyone tell me what rearend I have and how to remove the brake drums? Here are pictures.
https://picasaweb.google.com/Bompajohntaylor/1947HubAndBrakeDrum?authkey=Gv1sRgCJLrmv--m7ew6wE#

I'm not sure where it came from, but it has inboard drums so the whole hub will have to come off. The flat spot have to be a jamb nut. Measure from flat spot to flat spot and get the right socket and unscrew it. There will probably be another nut under it. Does the bolt pattern on your rear wheels match the front?

I asked the same question on the one ton forum and LONGBOX55 suggested it was a seal. I hate to probe anything with a screwdriver for fear of messing up something unkown. But, I gently stuck a small screwdriver into a slot next to what looked like the face of a bearing and it actally moved when I put pressure on it. I worked the screwdriver around and popped out the seal revealing the large nut and locking nut behind. I.d still like to know what year it is. The rearend has a large raised GMC logo and ten bolts two of which are out of order. It looks newer than the rest of the vehicle and LONGBOX55 thought it might be a special order or even from a 1941 1 1/2 ton. The previous owner said it cruised at 55 mph?? It has 2000 ore. tags and was used as a movie prop and could have have had work done previously.

Hy 46andonehalf, I did some research in my parts book, that double flange rear hub was used on CC and EC 250 series [1941 -47]. If it is stamped 81978, then it is p/n 2133491, if it is stamped 82951 then it is p/n 2213259, so it is probably the correct setup for your truck, hope that helps.

Thanks 3B. It is an EC 252. Know anywhere I can get some literature on it? Also, the parts manual says an EC model was from 1935? The serial # is 1407 and the engine nets 85.5 HP at 3000 RPM. The GVW is 8800#. What info can you give me on those clues?

3B, I'm really new to this can you tell me where to find the number stamped on the rear end. When the snow melts I'll pull it outside and take the stakebed off. That will let me get to every thing. Right now it is so covered with road grime and grease especially from the hydraulic dump that it's hard to tell. I scraped as much as I could with a putty knife but I think I'll try some simple green next.

Hy 46andonehalf, in my book an EC252 was 1946 production only, serial numbers from 001 - 2701, so that fits with what you have. Your truck should have a 228 in it, and a wheelbase of 134 1/2". I'll do some more research.

Thanks again 3B. What book do you have and where can I get one??

Welcome to the 'Bolt! Have you cruised over to Old GMC Trucks to look around? There's an abundance of info on that site (tho I dont' think organized very well) and they have a lively forum too. Somebody there can/will probably be helpful. Good luck.

Hy 46andonehalf, the book I'm quoting is a GMC Master Parts Book, 100 thru 470 [1939 - 1950], 100 - 22 thru M470 - 30 [1951 - 1954, the part number for the book is X-154001. You can find them at swap meets, possibly E Bay, here in the for sale forums.

Thanks 3B!

Thanks Frank50. I signed up today but there is a waiting period till the staff okays you.