How do I read axle codes? - Ford Powerstroke Diesel Forum
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Old 01-23-2012, 07:58 AM
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How do I read axle codes?

I have been shopping around for a 6.4 and have been trying to figure out what the axle codes in the door jam stand for. I have seen alot of 3L codes and I believe that is a 3.73 limited slip.

The truck I am interested in now is a 2010 King Ranch FX4 3J which I think is a e-locker 3.73. But I am not for sure. Can anyone shed some light on this? Thanks.
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Old 01-23-2012, 02:10 PM
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Looks like 3J is a 3.55 with limited slip

2008 Ford SD axle codes.
35 = 3.55 non-limited slip
3J = 3.55 limited slip
37 = 3.73 non-limited slip
3L = 3.73 limited slip
4L = 4.30 limited slip
4N = 4.10 limited slip
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Old 01-23-2012, 04:24 PM
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Thanks for the help. Do you by chance know what the code for what an e-locker rear end would read? I believe they were in the fx4's in 2010.
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Old 01-23-2012, 07:17 PM
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Not till 2011 trucks
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