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Diff leaking

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 80K5, Aug 21, 2001.

  1. 80K5

    80K5 1/2 ton status

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    My front diff seems to be leaking allot. Its comeing from were the drive shaft goes into the differential. Does anyone know how i could fix this or if there are any sealant types of greese. And what kind of Diff oils do you guys use?
    Thanks

    Stuck? Isn't that a bird!
    Steve
     
  2. 80K5

    80K5 1/2 ton status

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    Oh yeah its a 10 bolt to out of an 80 blazer.

    Stuck? Isn't that a bird!
    Steve
     
  3. I know exactly what it is. It is your pinion seal that is leaking. I just replaced the one in the rear end of my '86 K5 last weekend. The seal runs about $6 at any parts store. Step by step is like this. 1. Break apart the drive shaft from the yoke (match mark everything!). 2. Using a 1 1/4" socket(assuming this is a 10 bolt), remove the yoke (make sure you have counted the number of exposed threads with the nut tight before disassembly). 3. With a center punch or screw driver, remove the old pinion seal. 4. Clean the old sealant off of the area where the seal was seated. 5. Using Permatex or equivelent, run a bead of sealant around the outside lip of the new seal. 6. Install the new seal, making sure it is seated squarely in the housing,flush with the end or a little countersunk ( a 1 7/8" socket and hammer works great for this, but anything suitable will do). 7. re-install the yoke and tighten the nut, ensuring there are the same number of threads are exposed as when you took it apart. 8. Re-install the drive line and fill the differential. That simple! I would suggest you purchase a manual while you are buying the seal (a Hayne's manual).

    God has a hard on for Marines, because we keep Heaven chock full of fresh souls!
     
  4. ftn96

    ftn96 1/2 ton status

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    He summed it up pretty good. The permetex is not mandetory less your leaking around the outter edge of the seal. If its leaking from the rubber seal you dont need it.
    The gear lube will will 80w90 or 90 which ever your local shop carries. Just fill it up till it starts runnign outta the fill hole.

    Just say no to crack(s)
    <a target="_blank" href=http://www.nashvillek5.freeservers.com>www.nashvillek5.freeservers.com</a>
     
  5. JoeAngelicchio

    JoeAngelicchio 1/2 ton status

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    Did mine, same problem.

    <font color=green>Joe Angelicchio
    <a target="_blank" href=http://community.webshots.com/user/jangelicchio>http://community.webshots.com/user/jangelicchio</a>

    Lisle, Ontario, CANADA</font color=green>
     
  6. Executioner

    Executioner 1/2 ton status

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    FYI, make sure you understand "Pinion Bearing Pre-Load " !!
    Good luck
     
  7. dyeager535

    dyeager535 1 ton status Premium Member

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    BTW, the FIRST thing to check si the pinion yoke nut. If that loosens up, it WILL leak. Front axle typically sees so little usage, I doubt wear would be the failure cause.



    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</a>
    No anti-theft measures on your truck? No pity when its stolen
     
  8. ftn96

    ftn96 1/2 ton status

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    <blockquote><font class="small">In reply to:</font><hr>

    FYI, make sure you understand "Pinion Bearing Pre-Load "

    <hr></blockquote> What does this mean. I've never heard that before![​IMG]

    What is and what should never be....
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  9. dyeager535

    dyeager535 1 ton status Premium Member

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    Don't forget to lube the seal with some sort of grease before install! Vaseline would probably work, but something a little thicker would probably be better. Wasted my first replacement seal that way.


    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</a>
    No anti-theft measures on your truck? No pity when its stolen
     

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