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Evil Wicked Mean And Nasty
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The earliest style tag I have found in my search is used mainly on 57/58 Fords and all the tag has on it is the RATIO nothing else. So far its a 57/58 rearend. Hope this help somewhat. Cole
 

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i had a diff out of a chevy. from the same vintage had one hell of a time identifying it. the closest thing that it resembles to me if i squint hard at the screen is a toyota 8". but as far as i know they dont use a fill plug on the 3rd i always see it on the housing on the back it was worth a shot i guess
 

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Differential/Driveline
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http://www.concoursparts.com/

Look under the 1949 to 59 Ford "Big Cars" That looks real similar to a diff I had in my shop. The only way I could ID it was to get all the Brg numbers and match it up but I really never got a "model" figured out,I just got the Brg's I needed. If your needing some hard parts you may be in for a hard time finding them.

That web site is a PAIN to find anything,but its the best one I've found so far.Try searching with key words and then you will need to match up your Brg numbers.
 

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Certifiable Streetrodder
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looks like a 56 oldsmobile to me? :confused: , not a ford 9 in, they used to use the olds rearends in racing before the ford 9 in came out, I took one out of a customer streetrod last spring as it was improperly narrowed and replaced it with a 9 in ford. Are there any olds fans out there?
 

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Differential/Driveline
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Some of the 1949 to 1956 Ford full size came with the Spicer 41 But I've run across some odd ball's that where not the 41.

Look on your third member and see if you can read any numbers. I have a housing here at work and the case numbers are:

WAD4025A : Located in between the third member mounting bolt holes top passenger side.
6-52: Located in between the top 2 web's on the drivers side of the third member housing. Mine also has a small tag with no model ID but with 3.78 ratio marked. This one turned out to be a real odd ball diff.
 

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sure looks like a common 9" to me

perfectly round shape and all.


hmm..

why is it not a 9" ?

looks identical to the ones stuck under our 69 fairlane 4 link and the 54 ford pickup also.

hmm


57 fairlane 9" 3.22 ratio:

http://www.hemmings.com/hcc/stories/2006/07/01/hmn_buyers_guide1.html?t=printable

REAR AXLE

With its rugged semi-floating axles, the ever-durable Ford 9-inch hypoid differential came with several different gear ratios depending upon the engine choice. With the straight-six/Ford-O-Matic combo, the gear ratio is 3.22:1, the 3-speed manual had a 3.89:1 ratio, and the 3-speed with overdrive used a 4.11:1 ratio.
good luck!
 

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Differential/Driveline
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Discussion Starter · #13 ·
prostreet6t9 said:
Some of the 1949 to 1956 Ford full size came with the Spicer 41 But I've run across some odd ball's that where not the 41.

Look on your third member and see if you can read any numbers. I have a housing here at work and the case numbers are:

WAD4025A : Located in between the third member mounting bolt holes top passenger side.
6-52: Located in between the top 2 web's on the drivers side of the third member housing. Mine also has a small tag with no model ID but with 3.78 ratio marked. This one turned out to be a real odd ball diff.
Thanks sor the help thus far....I'll take a look and see if I can locate any more numbers this evening.
 
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