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Slip Yoke Problems, I think??

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by **DONOTDELETE**, Apr 24, 2001.

    Hello all, I filled up my transfer case last night and it seemed like it just came right out the rear output(by morning). Is that the slip yoke? If so is there a seal that needs to be replaced? It's an NP208. It has been leaking a little, but when I came out this morning there was a puddle of ATF under my truck.

    I thought I read something here about this problem, but when I did a search I found nothing.

    '84 K5

    Chevy in my blood.
     
  1. ftn96

    ftn96 1/2 ton status

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    Yep, you need to replace that seal. That should fix your problem. The seal is sorta a pain to get out depending on how long its been in there. Worst case scenario, you can take that output shaft housing off, with those 4 bolts. the you can knock the seal out from the back side. then use some RTV replace the housing and torguq the bolts then tap your seal back in with a little grease adn you should be good to go.

    Will work for beer, parts and tools.
    90 Jimmy 350TBI-TCI 700R4-241-33" BFGs-10 bolts w/4.10's,
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     
  2. Emmettology 101

    Emmettology 101 3/4 ton status

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    It could be coming out of either of two places if it is coming out by where the rear driveshaft goes in.

    1. it could be the main seal in the rear that the rear driveshaft slip yoke enters. Not hard to fix, just pull the rear D-shaft and pull out hte old seal and pop the new one in.

    2. Or it could be coming out of a hole in the d-shaft slip yoke. A while back there was take about this and Jesse at Highangle drivelines comfirmed this. The is a small hole that is sealed when new but leaks when it is old.

    I would change the rear seal first and see if that ifxes it. The seal should only be a ouple bucks and doesn't take long to change.



    Mike - <A target="_blank" HREF=http://emmett.coloradok5.com>http://emmett.coloradok5.com</A>[​IMG]
     
  3. ftn96

    ftn96 1/2 ton status

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    Sorry, I meant to say, that first try using a large flat head screw driver and try prying the seal out. The only problem with htis is that the output shaft is sorta in the way.

    ALSO, Big note here. When you go to put the driveshaft back in make sure you take some good thick high temp grease or lube. About one big fingers worth and smudge it inside the yoke of the driveshaft. This will prevent any "CLUNKING" when brakeing in the future. this is very common on slip yoke t-cases.

    Will work for beer, parts and tools.
    90 Jimmy 350TBI-TCI 700R4-241-33" BFGs-10 bolts w/4.10's,
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     
  4. Thanks all! I will attempt that this weekend. I have never replaced the u-joints, should I do that while I have everything out?

    '84 K5

    Chevy in my blood.
     
  5. ftn96

    ftn96 1/2 ton status

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    Hate to see you waste the money if they are still good. But they are only about 10 bones each. So you could just for the piece of mind.

    Will work for beer, parts and tools.
    90 Jimmy 350TBI-TCI 700R4-241-33" BFGs-10 bolts w/4.10's,
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     
  6. FRIZZLEFRY

    FRIZZLEFRY 1/2 ton status

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    My slipyoke was leaking through the end so I cleaned it off real good with brake cleaner and put a spot of JB Weld over the small hole in the end of the yoke.No more leak.

    All work and no play makes Frizz a dull boy.
     
  7. dyeager535

    dyeager535 1 ton status Premium Member

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    Also have to add, lube up the seal extremely well with thick grease. I didn't do this on my last pinion seal, and it leaked after about 3 days. Something about reading the instructions in the service manual or something... : )

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  8. ftn96

    ftn96 1/2 ton status

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    Yep, you need to grease that seal. For some reason, why I dont know but it works. I too had to replace mine after a week. For some reason that seal needs a preload liquid seal. IE the grease to create your air tight seal. You would think that the tranny fluid in the T-case would do that for you. But it doesn't. Also, that yoke and seal see alot of revolutions, and even the smallest piece of trash can cause it to start leaking prematurlly. So clean the outside of the yoke real good before you put it in there.

    Will work for beer, parts and tools.
    90 Jimmy 350TBI-TCI 700R4-241-33" BFGs-10 bolts w/4.10's,
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     
  9. K5 NUTT

    K5 NUTT 1/2 ton status

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    Without opening my GM manual...slipyokes not only use a output seal but there is most likely a bronze bushing in the tail shaft of the t-case that has expired from many years of use....and the slipyokes have been known to leak fluid past the splines...and out thru a small hole in the slipyoke....so look her over good. You could allways put some dye in the system before repairing it to find out exactly where it is leaking.

    Azblazer

    1979 K5
    1976 K5 Chalet
    1972 K10 Suburban
     

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