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Help Needed-posi Unit Id

Discussion in 'Early CJ5 and CJ6 Tech' started by WestCoastPat, Oct 13, 2019.

  1. Oct 13, 2019
    WestCoastPat

    WestCoastPat Member

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    I have a 1969 CJ5 with a 225 V6. It has a limited slip unit in the Spicer-Dana 44 rear end. Gear ratio is 4.88. Can anyone help me with the real name of the limited slip and or the part number for the clutch pack? Thanks. WestCoastPat
     
  2. Oct 13, 2019
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member

    Tantallon, Nova...
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    Probably a Trac Loc but we'd really need a pic to be sure, after that long really anything could be in there.


     
  3. Oct 13, 2019
    timgr

    timgr Jeepin' Nerd 2020 Sponsor 2019 Sponsor

    Medford Mass USA
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    Flanged axle should be a Dana-Spicer TracLock. Tapered (nutted) axle should be a Dana-Spicer PowrLock. If factory equipped. Unlikely a '69 has a flanged axle, but possible.

    Again, should be if factory equipment, not aftermarket. Pull the cover and take a picture.
     
  4. Oct 13, 2019
    WestCoastPat

    WestCoastPat Member

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    I guess I should have mentioned that it was in the JEEP back in 1969 when I bought it new. Last night I looked at a lot of stuff on the computer about replacing the friction discs. And one of the things I found explained how to test if it was working good or needed service. I don't know where I found the info, but it was basically putting a torque wrench on one wheel with the other one blocked and on the ground. I wish I remembered what the procedure and expected reading was. Anybody know about the test?
     
  5. Oct 13, 2019
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    FWIW there should be a tag held down with a differential cover bolt that says power-lok if the Jeep came with it.
     
  6. Oct 13, 2019
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    My manual is new from '69, for Jeeps through '69 (wish I had kept mine). The torque is a minimum of 40lbs should be required to continuously turn the wheel smoothly, disregarding the torque it takes to get it started turning. You put the wrench on the axle shaft nut. The manual says this test only applies to power loks with dished plates though, so to do it you need to determine what kind of plates are in it apparently.
     
  7. Oct 13, 2019
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    The other kind of test says to tighten the brake shoes on the raised wheel until you can barely turn it by grasping the tire. Use a roller type floor jack and don't block the wheel that's on the floor. Start the engine, put in low gear and carefully engage the clutch, vehicle should roll forward if the power-lok is operating correctly. Obviously you wouldn't need to roll far. This test can be done for either kind of power-lok that would be in there.

    That's a bit more risky test! :rolleyes:
     
  8. Oct 14, 2019
    Keys5a

    Keys5a Sponsor

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    A quick and dirty test to check a limited slip rear is to jack up one wheel off the ground, and the opposite wheel on the ground and chocked (and the brakes off/in neutral). Grab the raised wheel by the tire and try to rotate it. If it turns with only a little-to-moderate resistance, the clutches are shot. If you can muscle it around with a lot of resistance, the clutches are working.
    -Donny
     
  9. Oct 14, 2019
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    The manual says that is only for dished plates however.
     
  10. Oct 14, 2019
    Keys5a

    Keys5a Sponsor

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    I'll have to try my way on a Trac-Lok thats known good. The Trac-Lok that I pulled to swap with a fresh PowrLok was essentially an open diff, and it was really worn! That fresh PowrLok was so tight, I couldn't budge the raised tire, but it had never been run.
    -Donny
     
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  11. Oct 14, 2019
    sgogpn

    sgogpn Member 2020 Sponsor 2019 Sponsor

    Glendale, AZ.
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    IIRC, the Trac-loc wasn't available until the Intermediates in 72. You very likely have a PowerLoc. Good for you; they are a great unit.

    FWIW,
    Mike
     
  12. Oct 24, 2019
    oddfirejeeper

    oddfirejeeper Active Member

    Hamilton, MI
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    '71 had trac-loc
     
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  13. Oct 25, 2019
    CHUGALUG

    CHUGALUG Member

    Silverton, OR
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    My Dads early 70 J3000 had a posi unit in one of the axles as I remember him getting home from a hunting trip that had a lot of downhill on ice and snow covered roads and taking it to the dealer to have it taken out. It almost drove him off the edge of the road a number of times he said.
     
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  14. Oct 25, 2019
    mike starck

    mike starck Member 2019 Sponsor

    salem,oregon
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    They can be counter productive on ice.:)
     
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  15. Oct 25, 2019
    jzeber

    jzeber Well-Known Member 2019 Sponsor

    Morgan Hill, Ca
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    My 71 had a Trac Lock. I blew it up and rebuilt it twice. I got rid of it the 3rd time it broke and replaced it with a Detroit.
     
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  16. Oct 25, 2019
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    Yep, there are times you might not necessarily want to go straight.
     

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