I'm trying to identify some stuff on my 1952 GMC 9700 (Canadian 3 ton) It has the GMC built 248, and I'm not sure on what the transmission or axles are. It has a vacuum operated 2 speed rear. All I've managed to find is a cast number "19750" above it is a "M" with a square around it, and that the shifter arm is a 25397. Front axle doesn't seem to have much to identify it, but from reading Griggs disc brake post it could be a Clark F466? never seen any info on those. Bolt pattern on both axles is the big 5 pattern, 5 on 8" with a hub center of 6". Any ideas on where to look?
Hy 40_chevy, your trucks rear axle could be a Timken double reduction two speed, I'd have to do some research to come up with the identity of your trucks front axle. Any chance of some pictures of the rear axle?
Start looking for a GMC 302, it will bolt right in. No matter what your rear is, ratios are probably slow and slower. Start looking for a Brownie trans.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires. '47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle. '54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed. '55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
Regarding the front axle, I've seen no tag, (or holes for screws or broken off drive screws), and no casting numbers or stamped numbers. Pictures attached, 1 of the front within the rest of the rear pics. I'm not too worried about gears, don't have anywhere that I can, or have the need to drive fast around here, probably 50 tops and I have my '40 Chev for road trips. My main concern is brakes. They've never worked for me, and I don't think they worked much for my grandfather. Maybe occasionally with a lot of pumping. The 248 ran decent last time I drove it (summer '09 I think. Time flies!).
Hy 40_chevy, I know I posted about this earlier tonight, but my post doesn't seem to be here, and I can't find a record of my posts. At any rate your pictures identify your trucks differential as a single reduction Eaton two speed, hope that helps.
I'll second 3B, as it looks like what's in my 52 Chevrolet 1700, and the Canadian maintenance manual refers to it as Eaton 2 speed. Front axle though I'd have to look up. Surprised yours is 5 bolt though. I thought most of the Canadian builds were 6 bolt like mine, I'll look that up too. Is it possible hubs were changed at some point?
3B and 52vff, Thanks That does help. It's been a family truck for a while, before my grandfather had it it was my great uncles, and another great uncles before that. Great family history on it, no service history. I'm not sure if the hubs were changed or not.
52vff, I was out on http://67-72chevytrucks.com and saw a build thread for another '52 gmc 9700 (never thought I'd see another one of these in the same year!) It's out in Kitchener, maybe you've seen it. (Btw, I used to work in Brantford) I'll attach a pic of when it was stock (it's now slammed on the ground with a diesel engine) I see what you mean, this other 9700 has the 6 lugs too. I asked my grandfather, he told me to ask my great uncle Bruce... We'll see...
