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Old 10-03-2012, 07:48 PM
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Differential Decoding Help?

Hello! I was hoping someone could help me decode the stamping marks on my differential. It's been painted over, and the original metal tag (if there was one) is gone, so this is all I have:

I THINK this is what they say, feel free to correct!

DIF 41

Here are the links to some pics if they help too:




Thanks for any help you can offer me! Just bought the car and trying to figure out what everything is

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Old 10-04-2012, 04:26 AM
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Those are Casting Numbers & Dates. They wont tell you the gear ratio.
It looks like a 9" inch Ford to me.
For ratio Info, you'll have to count the Pinion & Ring gear teeth & divide Ring by Pinion teeth #.
Can also rotate the tires 1 revolution & count the Driveshaft revolutions if Posi Diff. If Open Diff rotate 1 tire 2 revolutions & count DS revs.
Tag codes >> Ford Rear Axle Assembly Identification - Page 01 - FORDification.com
Other IDs >> http://www.maliburacing.com/ford_9_i..._nine_inch.htm
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Old 10-04-2012, 07:42 AM
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For my own curiosity, whats this in anyway?
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Old 10-05-2012, 07:28 AM
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Originally Posted by Tattooed_Pinup_Girl View Post
Hello! I was hoping someone could help me decode the stamping marks on my differential.
Links to info on ID'ing the rearend can be found here. Good luck.
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9 inch, differential, ford, rear end

Recent Transmission - Rearend posts with photos

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