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What Year Is This Differential

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Old Aug 4, 2021 | 08:51 AM
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What Year Is This Differential

What year is this 9", I can take more pics if needed. I need to order a couple drum brake parts and they need a year make model at Oreilly. From a little research the 389 means 3.89 ratio




 
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Old Aug 4, 2021 | 09:15 AM
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"4AB" is the date code. 4 is the year, A is the month and B is the week. So your rear was built the second week of January, either 1964 or 1974. Ford changed the style of tag in very late 1973, this is the earlier style so I would suspect 1963.
 
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Old Aug 4, 2021 | 09:20 AM
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this link may help:

Ford Rear Axle Assembly Identification - Page 01 - FORDification.com


Ford 9”, 3.89 gear ratio, 63-71 Ford truck but still need decode for the date code on your tag 4AB and plant code 301.

Also assumed you are missing the “W” on the first code “BG”. Meaning I think it was “WBG-F2” originally.

I could be very wrong though. I’m sure someone with more expertise will chime in for more clarity.

Good luck in your search.

Edit:

using info from Mike for 4AB decode and year range from my info above, looks like week 2 of January in ‘64
 
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Old Aug 4, 2021 | 10:33 AM
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Originally Posted by rustylightning
What year is this 9", I can take more pics if needed. I need to order a couple drum brake parts and they need a year make model at Oreilly. From a little research the 389 means 3.89 ratio
They don't care about ratios or what year the axle housing is, they want to know if it is a 1963 Ford F-100 pickup or what?
Likely has 10 or maybe 11" drums.

 
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Old Aug 4, 2021 | 10:49 AM
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Originally Posted by tbear853
They don't care about ratios or what year the axle housing is, they want to know if it is a 1963 Ford F-100 pickup or what?
Likely has 10 or maybe 11" drums.
The truck that it is in is irrelevant because it was swapped into the truck from something else, just have the tag to go off
 
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Old Aug 4, 2021 | 11:02 AM
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Well no fill plug in the carrier it's in the housing. I would say that is a 1963 unit.
 
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Old Aug 4, 2021 | 01:33 PM
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Thanks for the help everyone. I went down to Oreilly and Napa but neither one had the parts I'm looking for. Im looking for the parking brake levers and links if anyone has some sitting around they would want to sell. Also need the parking brake lever equalizer that connects the 2 rear cables to the front cable (not part of diff I know just mentioning I’m looking for it if you have an extra)



The parking brake lever is the red circle on left and the link is the top circle, disregard blue spring
 
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Old Aug 4, 2021 | 04:15 PM
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Originally Posted by rustylightning
The truck that it is in is irrelevant because it was swapped into the truck from something else, just have the tag to go off
Well, you maybe know if it's Ford, you can measure diameter and shoe width too. It is a drum brake. Ford used a lot of 9" drum brakes, a lot of 10" drum brakes, and a lot of 11" drum brakes like on the back of my '77. Some of what you are looking for was also used by GM or Chrysler or International.

Have you got anything to match up? You think or know that the whole rear was swapped including brakes or just the rear between the brakes??? Salvage yard might be the place to look.
 
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