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Old 12-26-2009, 10:48 PM
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I.D. help

I just picked up a rearend that came out of an early Ford Fairlane (60's or 70's maybe). The tag reads as follows;
C20A4001 EN 816
3.25 2AA
It looks like its an 8" and the gear ratio is a 3.25 but the other numbers I don't know what they mean and I tried finding it in the "fordification" site but was not able to. Experts please help. Thanks in advance,,,,,
Ernie

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Old 12-27-2009, 06:34 AM
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hi Ernie, Welcome to Hotrodders.com

I split off your new question on rear diff ID from the thread you posted to.

That way the guys here know there is a new question from a different member
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Old 12-27-2009, 12:08 PM
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You are missing a number off of the tag. There should be another number after the 3.25 and before the 2AA. This will be an 8 or a 9, which will be the size of the ring gear, or rear end.
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Old 12-27-2009, 12:48 PM
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Post some pics of the housing you have for us to have a look see.

Cole
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Old 12-27-2009, 09:10 PM
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Thanks to all for your input. I looked again at the tag and thats all that is on there. The tag is not damaged or altered. I will post pictures of both the tag and the rearend next week when I get back. Thanks again,,,
Ernie
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Old 12-28-2009, 09:03 AM
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It's very easy to tell a 9 inch from a 8 inch. If you can take all 10 nuts off of the case with a ratchet, extention and socket then it's a 8 inch. If you have to use a wrench to get the bottom 2 nuts off then it's a 9 inch.
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Old 12-28-2009, 01:21 PM
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Thanks to "Crosley" and "big gear head" for your help. I guess what "big gear head" means is that there is no room for a socket and an open end wrench has to be used, right?
Ernie
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Old 12-28-2009, 01:29 PM
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Quote:
Originally Posted by aztlanco
Thanks to "Crosley" and "big gear head" for your help. I guess what "big gear head" means is that there is no room for a socket and an open end wrench has to be used, right?
Ernie
correct, end wrench needed on 9 inch bottom center section nutz on the studs.

If the unit is a 3.25 gear , I suspect it is a 9 inch.. Seems like that was a common gear ratio for a 9 inch.

the 2.79 and 3.0 gear ratio was more common in 8 inch differentials I have seen
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Old 12-28-2009, 01:42 PM
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Yea, that's what I meant, there is not enough room to get a socket on the bottom 2 nuts on a 9 inch.
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Old 12-28-2009, 01:48 PM
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Quote:
Originally Posted by big gear head
Yea, that's what I meant, there is not enough room to get a socket on the bottom 2 nuts on a 9 inch.
You know as many of these i have messed with through the years i always forget the bottom bolt deal.

Cole
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