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Leaking Transfer Case

Discussion in 'Early CJ5 and CJ6 Tech' started by weedy, Sep 29, 2008.

  1. Sep 29, 2008
    weedy

    weedy Member

    Conroe, Tx
    Joined:
    Apr 19, 2005
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    156
    I am hunting down a 90 weight leak and I think I have found it to be the output shaft (front drive shaft seal). It has always leaked oil from the rear main but now it will leave a small puddle of 90 wt each time it is parked after a short drive. The tranny leak came on all of a sudden instead of slowly getting worse. I am afraid I will run it dry if I continue driving it without replacing the seal. Any information or pointer is welcomed.

    Questions

    Is this a common place for the transfer case to leak?

    Where are the most common places for 90 wt leaks?

    Will the driveshaft yoke come off without a puller?

    Can the seal be pulled with a screw driver?

    There are two paper looking gaskets and a oil seal in my leak kit I purchased (Crown Seal Parts). The manual shows an oil gasket on each side of the metal seal. Is this correct?

    Thanks for all the information.
     
  2. Sep 29, 2008
    weedy

    weedy Member

    Conroe, Tx
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    Apr 19, 2005
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    I forgot to add that I am trying anything NOT to pull the tranny or transfer case.
     
  3. Sep 29, 2008
    Hansh

    Hansh Going Mobile

    SE Wisconsin
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    Dec 7, 2004
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    They leak any place the oil can seep out.

    Yes the driveshaft yoke should come off without a puller.

    You may be able to get the seal out with a screwdriver, but a seal puller is better.

    IIRC the Crown seals are single lip. IMHO if you are doing the work you should replace it with a double lip seal. I have bought them thinner and installed two to have 4 lips sealing (I'll have to look up the number later), the only leak I have now is the speedo cable output (I think). If the yoke is worn you may have to install a redi-sleeve.

    HTH
     
  4. Sep 30, 2008
    weedy

    weedy Member

    Conroe, Tx
    Joined:
    Apr 19, 2005
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    Thanks. Excellent advice. I look fwd to the part #.


    Can you install two seals back to back? I though I remember someone writing about that. I do not know how deep the opening is for the seal?

    My goal is to seal everyting I can reach without removing the transfer case.
     
  5. Sep 30, 2008
    Homebrew2

    Homebrew2 Member

    Dunlap, CA
    Joined:
    Aug 17, 2007
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    511
    Double lipped seals:
    Fed. Mogul, CarQuest, Kragen, AutoZone: #473229
    Napa: #NOS 15635
    Right now AutoZone is the cheapest I've found.

    I just did one about as old as yours and could not budge the seal with screw driver or seal puller.
    I had to jack it out with 1.25" sheetmetal screws. Like it was JB welded in.
     
  6. Sep 30, 2008
    weedy

    weedy Member

    Conroe, Tx
    Joined:
    Apr 19, 2005
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    I thought about screwing screws in it on each side of the seal and then using a crow bar to ge the seal out?
     
  7. Sep 30, 2008
    lamar

    lamar Member

    greenville sc
    Joined:
    Jan 25, 2004
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    IIRC the Crown seals are single lip. IMHO if you are doing the work you should replace it with a double lip seal. I have bought them thinner and installed two to have 4 lips sealing (I'll have to look up the number later), the only leak I have now is the speedo cable output (I think). If the yoke is worn you may have to install a redi-sleeve.

    HTH[/QUOTE]

    i'm getting ready to do the same thing to my trans-fer case.
    would you happen to have the redi-sleeve number for the yokes?
     
  8. Sep 30, 2008
    AKCJ

    AKCJ Active Member

    Fairbanks, Alaska
    Joined:
    Aug 12, 2003
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    1,035

    I've had to resort to the sheet metal screw method a few times. Once you get the screw(s) in grab hold with the vice grips and pull. Sometimes you can lever the grips against the outer edge of the part containing the seal - may work better with a spacer to lever against.
     
  9. Sep 30, 2008
    weedy

    weedy Member

    Conroe, Tx
    Joined:
    Apr 19, 2005
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    Good idea on the vice grips. Any other hints for leak prevention without removing the case?
     
  10. Oct 1, 2008
    Hansh

    Hansh Going Mobile

    SE Wisconsin
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    Part Numbers I have are the following:

    Output Seal - National 473229
    Shift Linkage - National 471532

    Redi Sleeve - National 99155

    If you use 2 output seals they have to go in the same way face to back. One goes all the way in and the second butts up to the other. I split the felt washer in half with a sharp razor. You may or may not need to split it. When you install two seals the inner one is hard to remove if you ever have to replace them.

    Good luck with your project.
     
  11. Oct 2, 2008
    Homebrew2

    Homebrew2 Member

    Dunlap, CA
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    Aug 17, 2007
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    Interesting, the seal you list seems to be for a 0.593" (Napa, PartsAmerica) shaft. My seals crossed to a 471466 which is for a 0.625" shaft and were pretty snug on the shafts.
     
  12. Oct 2, 2008
    Hansh

    Hansh Going Mobile

    SE Wisconsin
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    I have converted mine to a twin stick, not sure if they are different for a single stick TC.
     
  13. Oct 2, 2008
    Homebrew2

    Homebrew2 Member

    Dunlap, CA
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    Me either, I have the original twin stick ... what's a single stick?
     
  14. Oct 3, 2008
    weedy

    weedy Member

    Conroe, Tx
    Joined:
    Apr 19, 2005
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    Hansh

    Did you use the double seal? Does a double seal set up remove the need for the felt seal?
     
  15. Oct 3, 2008
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
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    Seals are the same between twin stick and single stick 18 transfer cases and all 20 transfer cases I've come across as are the transfer case gaskets. There are different gaskets between the transfer case and transmission however because of large hole/small hole differences and differences in the back of the transmissions (where the reverse idler and counter gear shaft stick out, etc.).
     
  16. Oct 3, 2008
    Hansh

    Hansh Going Mobile

    SE Wisconsin
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    Yes, two "double lip" seals. The national part # listed above.

    I do not know, I split mine in half and used it. It was too thick with the two seals in place.
     
  17. Oct 4, 2008
    66cj5

    66cj5 Jeep with no name

    NorthWest Indiana
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    you might want to pull the tranny tunnel (on the body) and check the freeze plugs on the shift tower. the oil sometimes pops the plugs out.
     
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