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  • FSJ Axle Identification

    This is a VERY common question on this forum so I will try to break this down for the masses:


    1974-1979 Full Size Jeeps:

    Front Axle:

    Passenger Side Drop
    Dana 44 (6-lug) or Dana 44 HD (8-lug)
    The 6-lug axle comes in both narrow and wide versions (Wagoneer is narrow, J-truck and Cherokee Chief* is wide)
    The 8-lug is wide only
    1974-1975, disc brakes were optional in these years. In 1976, disc brakes became standard on the front.


    Rear Axle:

    Dana 44 (6-lug) or Dana 60 (8-lug)
    The Dana 44 comes in narrow, wide and wider. (Wagoneer would be narrow, Cherokee Chief* would be wider and J-truck would be widest)
    All of the Dana 44's are offset, some are offset less but all are offset

    The Dana 60 is widest only and is a little off-set


    1980-1985-ish Full-Size Jeeps:

    Front Axle:

    Driver Side Drop
    Dana 44 (6-lug)** or Dana 44 HD (8-lug)
    **1982-1984 (6-lug only) could have a vacuum disconnect front axle - I have seen some 1985's with this as well.

    Rear Axle:

    AMC 20 (6-lug) or Dana 60 (8-lug)
    AMC 20 (6-lug) offset just a tad. This is much stronger than the CJ versions. This axle has 1-piece axle shafts stock and the tubes are thicker for use in the heavier Full-Size Jeeps.
    AMC 20 Axles come in narrow, wide and wider. (Wagoneer and Grand Wagoneer would be narrow, Cherokee Chief* would be wider and J-truck would be widest)

    Dana 60 Rear offset just a tad and comes in widest.


    1986-1991 Full-Size Jeeps

    Front Axle:

    Driver side drop
    Dana 44 (6-lug) or Dana 44 HD (8-lug)
    The 6-lug axle comes in both narrow and wide versions (Grand Wagoneer is narrow, J-truck is wide)
    The 8-lug is wide only

    Rear Axle

    Dana 44 (6-lug) offset just a tad
    Note, some early 1986's have been spotted with an AMC 20 rear axle.
    Comes in narrow and widest versions (Grand Wagoneer would be narrow, J-truck would be widest)

    *Cherokee note: Some 1974-1983 Cherokees can either be narrow or wide. This link will help break this down: http://www.bjsoffroad.com/cartgenie/....asp#Widetrack

  • #2
    For those of you interested in the WMS measurements, here they are:

    http://www.ttsfabworks.com/tech/WMS.html
    Last edited by Ryan; 10-04-2012, 01:19 AM.

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    • #3
      Link is dead.

      Any info on the WMS for a 1988 Grand Wagoneer, stock axles, front and rear?

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      • #4
        I just updated the link to the new site. click above and it'll open the WMS page

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