Can anyone identify my rear differential? 8 3/4 but wrong markings???

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PeterParker

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This is in a rare 1935 Australian Ford Ute I bought. I'm planning on making it fully Mopar-driven. The diff was previously connected to a powerglide/283 though.
10-Bolt, Front-Drop carrier pumpkin with no access in back.
Driveline is at center of pumpkin.
Looks similar to 8 3/4, but has unusual numbers on it.
391 is stamped under the filler bolt.
5 is stamped on lower left.
Screwed on plates with 2 and 10 are on upper left.
Is it not 8 3/4?

Any help is much appreciated.

Diff1.jpg


Diff2.jpg


Diff3.jpg


diff4.jpg


Diff5.jpg


Diff6.jpg
 
What are the markings left of the 391?
 
May be an early 8-1/4 chrysler, but it should have 11 studs instead of 10 like an 8-3/4 to be one of those.
 
Yup, looks similar but it's earlier... Same family butttt...
 
Have a look at 55-57 Chevy rears. Seeing how it was 283/powerglide powered it seems logical to me. And looks very similar.

6E82D417-6C02-4968-9D6C-F08EA2DB1F2C.png

Pic stolen from the web.
 
The 8 3/4 rear came out in 1957, the early rearends had axles that were different than the units of the 1960's and 70's. My Dad's 57 Dodge Custom Royal Lancer has one. Most people don't fool with the early 8 3/4 rearends.

www.forbbodiesonly.com

Chrysler 8 3/4" Rear Axle & Swap Information

Chrysler 8 3/4" Rear Axle & Swap Information Chrysler Corporation's 8.75" rear axle assembly first appeared in 1957. The measurement refers to the 8-3/4" diameter ring gear. This gear, which is turned by the pinion gear, changes the direction of the power being transmitted to it. The pinion...
www.forbbodiesonly.com www.forbbodiesonly.com
 
The early Mopar banjo rears would have had tapered axles- easy to I.D.
This is the rear out of a 1955 Ford. Looks like a match to me.
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1704391300278.png
 
PeterParker said:
So an early ford 9 instead I guess.
Click to expand...
I don't think so. Most of the "early" Ford 9's had "dimples" on each side of the pumpkin, while this one is smooth. Easiest way to tell if it's a 9" is to measure the spring perches, as they were a "standard" dimension, if memory serves, but it still doesn't look right to me, so.....

I did some digging here at work during my lunch, and I think what you is an 8-3/4" rear alright....but a Ford 8.75, not a Mopar.

Google "8.75 Ford rear" and you'll see what I mean.

And for your sake I hope I'm wrong, as I understand that finding parts for these can be a PITA.
 
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I have a 54 Ford and a 49 Plymouth to compare. Unfortunately, they are both 250 miles away.
Either way, it's pre-57 Ford or Mopar, and not a "nine inch" Ford or a 8 3/4 Mopar. Either one will be a ***** finding parts.
To be honest, I would plan on replacing it. My candidate would be an 8.8 ford.
 
I checked out bazza"s reference in #21. Sure looks like a 49-56 Ford to me.
Which means neither a later 8" or 9" will bolt into the housing.
I still would replace it with an 8.8
Edit: WOW! was that a misstype! An 8 or 9 WILL NOT bolt into that housing!
2nd edit:I misread what I wrote, I was right the first time........ and an 8 or 9 still wont fit, lol.
 
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