'39 3/4 ton Rear Brake Backing Plates

[svm99]

Dad & I have a '39 3/4 ton long term project. Every now and then we check our parts pile and just discovered we do not have rear backing plates. As near as I can tell from the Ford parts book the brakes shoes, components and E-brake cable are the same as '39-'41 car and commercial. The only listing I see for the backing plates is a part# 92Y 2213 &2214 for 122" trucks. The listing does not differentiate between 3/4 ton & 1 ton. Is this listing correct?

Which is the correct backing plate for a '39 3/4 ton? Any pictures would be a help also.

Thanks Paul

[GB SISSON]

AFAIK they are both 122" wheelbase trucks. I have never seen a 3/4 ton but I think they have the wide 5 bolt pattern as the '39 half ton. The One ton from '38-'47 has a 5 on 6 7/8 bolt circle and I think larger drums. Therefore maybe the 1/2 ton and 3/4 ton share backing plates. ??

[38 coupe]

I have a 47 one ton rear axle and a 41 3/4 ton rear axle at my Dad's shop. I won't be over there for about a month but I can take a look then to see if the backing plates are the same.

[alan]

measure your drums inside dia. if it 12" a car backing plate will work, also does your trans have a parking brake drum on it ?, if not 3/4 ton , if it has it 1 ton

[svm99]

Originally Posted by 38 coupe

I have a 47 one ton rear axle and a 41 3/4 ton rear axle at my Dad's shop. I won't be over there for about a month but I can take a look then to see if the backing plates are the same.

Thank you, that will be helpful if you could get a picture of the 3/4 ton rearend, we've looked at tonner rear axles.

[expavr]

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Attached is a page from the 1940 Ford Sales Reference Manual. It shows the rear drums on the 3/4 Ton being 12" diameter which agrees with part # 91D 1115 (12" dia rear brake drum 39-47). The rear drums on the Tonner are 14" diameter which agrees with part# 92Y 1113 (14" dia rear brake drum 39-47). This is a long way of saying that there is a 2" dimensional difference in the rear backing plates between the 3/4 and one ton trucks.

Also on this page is a reference to the 3/4 and 1 ton handbrakes which are attached by a cable to the rear brakes with an under dash hand lever left of the steering wheel. There is some linkage on the backing plate and brake shoes that interact to make that happen. I have photos of that hardware if you need them.
Les Williams

[expavr]

PS: I noticed that the rear backing plate part# for the 122" trucks was different than the comm/car part#. This leads me to believe that they probably won't interchange. I suspect that the 3/4 and 1 ton axle flange is larger than the comm/car flange and has a different bolt pattern.

[svm99]

Originally Posted by expavr

PS: I noticed that the rear backing plate part# for the 122" trucks was different than the comm/car part#. This leads me to believe that they probably won't interchange. I suspect that the 3/4 and 1 ton axle flange is larger than the comm/car flange and has a different bolt pattern.

Yes,..............this is my question. The Ford parts listing does not differentiate between the 3/4 & 1 ton in the 122" listing. Assuming the Tonner used 14" brakes and the 92Y is a Tonner part number for the listed backing plate.............which backing plate did the 3/4 Ton use?
Paul J.

[NealinCA]

Have you tried a standard 39-41 passenger 12" backing plate on the 3/4 ton axle housing?

[svm99]

Originally Posted by NealinCA

Have you tried a standard 39-41 passenger 12" backing plate on the 3/4 ton axle housing?

Not yet, I will when I have time. Thought I'd see what info others may have on 3/4 ton brakes.

Paul J.

[expavr]

Originally Posted by svm99

Yes,..............this is my question. The Ford parts listing does not differentiate between the 3/4 & 1 ton in the 122" listing. Assuming the Tonner used 14" brakes and the 92Y is a Tonner part number for the listed backing plate.............which backing plate did the 3/4 Ton use?
Paul J.

This is one of those inscrutable mysteries that only an old time Ford Parts counterman can answer. Maybe as some have suggested the 12" rear backing plate was used across the comm/car and 3/4 ton line and the Green Book doesn't clearly spell that out as it does with the front backing plates. IMO the part # isn't as important as finding a backing plate that will work on your axle. Did you contact Chuck Manzione - Chuck's Trucks in CT? He has a good working knowledge of the early Ford trucks and may have what you're looking for. Using the years associated with the 3/4 ton drum part number as a starting point I would assume that you would be looking for rear backing plates from a 39-47 3/4 ton truck. There was a wrecking yard in the Bay Area N of San Leandro that had several early Ford trucks they were parting out. I don't know if there was a 3/4 ton in their stash, but I'll see if I can find their phone# for you.

[GB SISSON]

The 3/4 ton was discontinued at the end of the 1942 model year. It reappeared in 1948, so your search includes '39-'42. Good luck and it would be great to see some pictures too.

[expavr]

"The 3/4 ton was discontinued at the end of the 1942 model year." Gary, it sounds like that memo didn't make it to the editors of the Green Book.

[redmodelt]

From what I read in the green book going by 1947 year, the 3/4 ton may have used the front plates. Does yours have the drive shaft parking brake? If so that might be the case, the front plates may have been used on the rear also.

[GB SISSON]

Originally Posted by expavr

"The 3/4 ton was discontinued at the end of the 1942 model year." Gary, it sounds like that memo didn't make it to the editors of the Green Book.

"This year (1942) witnessed the last production of 3/4 ton ford trucks until 1948" James Wagner, from 'Ford Trucks Since 1905' page 208, 1942 section. It would stand to reason that a genuine ford publication would be more accurate than a book written about the trucks years later, even if Wagner is the official truck counsel for the Early Ford V8 club.

[svm99]

Les,
If you can find any info about the wrecking yard let me know.
Thanks Paul J.

[expavr]

Originally Posted by svm99

Les,
If you can find any info about the wrecking yard let me know.
Thanks Paul J.

Paul
The phone number for the wrecking yard I have has been disconnected and there is no new listing. I asked my son-in-law who works for the SFFD to go by the site to see if its still there. He'll do this on Thurs and I'll get back to you. I also found some parts for the Tonner in CO [email protected]. They may have what you need. There is another option to consider and that would be to install a later model truck rear end (48-56). I saw a thread on that swap either on the EV8 or FTE sites. If you can get "Truck Dog's" attention who lurks on the Fordbarn, he can steer you in the right direction should you decide to go that route.
Les

[svm99]

Les, Thanks for the info. It'll be interesting to know if your son-in-law finds anything. I'll contact the CO email address also.
Paul