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Old Jun 4, 2011 | 12:21 PM
  #1  
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turbogus
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Laughing Gas
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From: Albany, Good Ol' USA
What differential is this?

Greetings from Oregon, the shower me state. My best friend has an old late30's early 40's truck with this differential. It may have been swapped in at some point but none of our resources show this particular diff.








If you know what this is please let us know.
Thanks and a lift of the lynch lid

Gus & Lee
 
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Old Jun 4, 2011 | 12:34 PM
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NumberDummy
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Looks like a 1942/47 'Commercial' (1/2 ton) rear axle, the axleshafts would have a 5.50" bolt circle pattern.

Who made it? Dunno, the 1928/47 parts catalog doesn't say, but I would guess it's a Spicer.
 
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Old Jun 5, 2011 | 03:18 PM
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turbogus
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Laughing Gas
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From: Albany, Good Ol' USA
Turns out the axle is a six lug on this one. I've never even seen this type of differential even when I was in the Marines (motor transport).
 
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Old Jun 5, 2011 | 03:23 PM
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6 lug: The axle could be from a Dodge, Studebaker or a GM product. All these trucks were used by the USMC (and every other branch of the military).

By the time you served (thanks for serving), the trucks with this type of rear axle had been sold off as 'war surplus.'
 
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Old Jun 5, 2011 | 05:42 PM
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Is the pattern very large? It could be an International "RA" type, I had one under a trailer. The only wheels I could get for it were split, so I replaced mine with a D60.
 
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Old Jun 6, 2011 | 09:08 AM
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turbogus
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Laughing Gas
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From: Albany, Good Ol' USA
I seem to recall our M35/M50 series trucks using Rockwell axles, but I could be wrong.
 
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