Identifying rear diff

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Apr 30, 2010 | 09:45 PM

briansortland

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Joined: Jan 2006

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Identifying rear diff

I have a 99 F150 with a standard rear diff. I am thinking of looking for one with limited slip but not sure how to identify one.

Does anyone know the appropriate tag codes.

Thanks

Apr 30, 2010 | 09:53 PM

steve(ill)

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Axle Codes
L - Limited Slip Differential
C - Conventional Differential
Code Ratio
18 3.08C
19 3.55C
24 3.54L
25 4.10C
26 3.73C
27 3.31C
28 3.73C
B5 4.10L
B6 3.73L
H9 3.55L

May 1, 2010 | 07:20 AM

fordf150farmer

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and if that fails you, there should be a tag on the diff that says something like 3 55 or 3L55 the space means open diff, and the L means limited slip. i just used the 355 as an example, but it should be the same for other gears as well.

May 3, 2010 | 07:40 AM

benningstspeed1.0

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From: SUNMAN INDIANA

you are looking for something like 3 55 8.8
like said above 3 55 is gear ratio and open or limited
8.8 is the diff size. f150's could have 8.8, 9.75, 10.50

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