The Ford Super Duty axle code 3j in an indication that Your vehicle is experiencing a 3.55 limited slip. The slip is usually around 3.73 for some Ford trucks, which comes out to a limited slip of 3.75
Chris G
July 11, 2022
NO, the 3J is an electronic locking 3.55. It's not a limited slip.
Shon P
November 9, 2022
No, Chris G is correct. I have a 2013 F250 Lariat Fx4, shift on the fly switch with electronic locker, with 3J axle code on the VIN sticker.
Tim W
January 21, 2023
3j is 3.55 electric locking 3L is 3.73 limited slip
Natalie W
July 30, 2020
The Ford super duty axle code 3j is 3.55 Limited slip.
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