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Where the heck is this leak coming from?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Burbinator, Dec 7, 2001.

  1. Burbinator

    Burbinator 1/2 ton status

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    As I was doing a visual on the underside of my Sub, I noticed that I had a decent amount of wet ATF and a little grease slung up onto the floor panel by the tail of the transfer case. The weird part is that there is no apparent source of the leak. The tail piece rear seal isn't leaking, u-joint is good, etc. and no other leaks anywhere else. The slip yoke portion of the joint is wet, but the driveshaft portion is dry, as is the cross itself.

    Any ideas?
    TIA

    The learning curve is a toll road...ride with someone who has already paid!
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  2. thatK30guy

    thatK30guy 1 ton status Premium Member

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    I had that problem on an '86 short bed K10 once. I even put in a new seal and it still leaked. [​IMG]

    I think some of the slip yokes have a small hole on the inside tip, by the u-joint. Some of these holes were meant for the grease to ooze out of.
    It's possible the fluid could be coming out of the small hole, but I'm not positive on this.


    I'm not picking my nose...I'm just pointing at my brain!! [​IMG]

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  3. 1986Blazer

    1986Blazer 1/2 ton status

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    Inside the slip yoke is a small zerk fitting that leaks after many many miles. Some people JB weld the fitting shut and some weld it. Mine, I just let it leak - kinda creates a good rust preventative coating. You can replace the slip yoke and it may cure it (about $85). You can convert to a fixed yoke - a little more expensive. But...that is most likely the problem


    <a target="_blank" href=http://www.geocities.com/keywestk5/KeyWestK5.html>http://www.geocities.com/keywestk5/KeyWestK5.html</a>
    So I says to him, I said, "get your own monkey."
    1986 K5, 350 GM Crate, 700R4, NP208
     
  4. Burbinator

    Burbinator 1/2 ton status

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    Rolled under the truck to take a look for that fitting/hole...that's exactly where it's coming from. Funny how it's blatantly obvious when you know where to look!

    We don't have to much of a demand for rust preventative here in Phoenix, so I think I'll JB it and call it a day this weekend.

    Thanks...and to thatK30guy as well.

    The learning curve is a toll road...ride with someone who has already paid!
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