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T-case leak

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 90K5, Jan 25, 2001.

  1. 90K5

    90K5 1/2 ton status

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    I haven't driven my truck in about a week[​IMG], and I noticed a little ATF on the ground under the t-case. I recently changed the fluid in it and used Mobil 1 synthetic. It never leaked before I changed it. Is that the cause of the leak? i know synthetic oil will leak before the regualr dino juice, but is it true with ATF too?

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  2. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    Mine does the same thing too. I've still got a leak around the drive shaft and I changed the seal, probably the seal in the pump hosing. I'm just going to find a seal/gasket kit and tear it apart one of these days. I have to be really bored to even attempt doing all that work for just a few leaks.

    June 2001 - The Texas Sawz All masacre begins. Be afraid rust, be very afraid. [​IMG]
     
  3. Mr Red

    Mr Red 1/2 ton status

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    Are you saying you changed the TC ouput shaft seal and it still leaks???? My new '91 does the same thing (slight leak @ output shaft @ rear). I'm not as worried as initially (when look'n @ rig-noticed the slight leak), as my neighbor who owns a 4X shop and has rebuilt many 69-91 Blazers said "they all do that." I ain't real hip on any leaks and was going to change that seal. Looked simple enough: pull d/shaft, yank seal, lube inside of seal, use gasket sealer on edges that mate to TC housing, and be done with it. Those were the instructions I read in my Chilton's book.

    Blazer_Boy if you replaced this seal, did you lube the inner part with clean fluid and use gasket sealer on the ridge that mates to the TC???? A while back I remember a thread about someone who did some of these seals and just because they didn't throw some juice on 'em before installing, they leaked. Must be something to it as I recall the thread, I think someone re-installed with some juice & had no further trouble. I need to know before I tackle this thing and I'm sure many others that read these posts would like to know.

    Thanks,
    [​IMG]
    <font color=red>David, '86 & '91 K5</font color=red>
     
  4. jarheadk5

    jarheadk5 1/2 ton status

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    If it's a 208 t-case, it mat be the slipyoke itself that's leaking. The yoke appears to be a press/weld fit onto the splined shaft, and mine leaks there (and judging by the number of times I've posted about this, a few others do, too). Search back a couple months ("slipyoke") and you'll find my solution to the problem (quick version: JBWeld at the bottom of the shaft to seal it).

    [​IMG] Semper Maintenance!
     
  5. Mr Red

    Mr Red 1/2 ton status

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    Funny, mines a 241 and I spotted the drip about to fall tonight in the garage. It looked like it was coming from the inside of the yoke rather than the shaft. Wonder if it's the same. I'll have to do the search later.

    [​IMG]
    <font color=red>David, '86 & '91 K5</font color=red>
     
  6. jarheadk5

    jarheadk5 1/2 ton status

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    EXACTLY!! It's coming from that circular notch/groove looking place right in the middle of the yoke itself. I think the 241 uses the same design of slipyoke (if not the exact same one...), so the problem is definitely out there.

    [​IMG] Semper Maintenance!
     
  7. 90K5

    90K5 1/2 ton status

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    Sorry i didn't say it before, its a 241, and the leak is where the two halves of the case are connected. I think I'll fill it with regualr ATF until the problem stops. Is is allright to mix synthetic and conventional stuff together?

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  8. Espen88k5

    Espen88k5 1/2 ton status

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    I added a quart last weekend, fun project getting the ATF out of the botle and into the t-case! I finally sacrificed my fatherinlaws beach-ball pump. Broka the pump trying to "borrow" the air hose, taped it to the botle and sqiezed the fluid in there. Pulled a muscle in my shoulder to, from the impossible angle I was at.

    My question is: It stopped leaking so I was worried and I added a quart last weekend. After the quart was added it was level with the upper fill-hole and now it leaks like normal again[​IMG]

    Is there still enough atf left in the case to still safely drive it if it leaks at the driveshaft, and the leak slows down after a quart is gone? . How much fluid does it hold total?.

    I'l have this looked at when summer comes around, but for now I will just pay attention to it.


    <A target="_blank" HREF=http://www.espen88k5.coloradok5.com>http://www.espen88k5.coloradok5.com</A>
     
  9. 90K5

    90K5 1/2 ton status

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    I *think* I read somewhere that its fine if its at the hole or 1/2 an inch below it.

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  10. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    Yeah, I had a fun time getting that in. I used a thin chisel around the edge and gently tapped it out. It took a while because I didnt want to mark up the aluminum. I took the new one, oiled up real good and put it in. I basically got an extremely oversized socket, put in a shop rag, placed it over the seal and taped it in with a rubber mallet. I didn't put it any sealant because it didnt leak there and the GM service manual made no mention of it. I checked the seal while tapping it in and it went in nice and straight. The leak itself is around the shaft, maybe its designed to do that. Think about that driveshaft rubbing around dry rubber all the time, a little ATF around there doesn't hurt. The leak that does bug me is the one around where the case halves meet. Is there just a gasket in between them, I can't seem to find any part number for it if does. I had a fun time getting in my fluid too. I figure if you get half the fluid on yourself and half in the case your sitting good. I actually just put one of the ends of a bottle of axle oil and slapped it on the ATF bottle. You can only squeeze about half the bottle in then you have to refill it.

    June 2001 - The Texas Sawz All masacre begins. Be afraid rust, be very afraid. [​IMG]
     
  11. 90K5

    90K5 1/2 ton status

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    All you need to fill it is a suction pump. A tube goes into the container and theres a hand pump, and another ube goes into the 'case. Mine was about $6 at Pep Boys, definately worth it.

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  12. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    haha, NOW I find out. Oh well, I did it the man's way, lol [​IMG]

    June 2001 - The Texas Sawz All masacre begins. Be afraid rust, be very afraid. [​IMG]
     
  13. Mr Red

    Mr Red 1/2 ton status

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    As far as a seal for the two halve, the shop that reasealed my 86's 208 used black gasket / RTV(?) on some that stuff. The 208 and 241 are much different though. I suspect that the same stuff could be used.

    As far as gasket sealer on the output shaft seal, that's the procedure in my Alldata/Popular Mechanics CDROM. Makes good sense to me and certainly wouldn't hurt anything to do it that way.

    [​IMG]
    <font color=red>David, '86 & '91 K5</font color=red>
     
  14. chevydude

    chevydude Registered Member

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    i have a 208 case that leaks between the two halves of the case,i cleaned it up with brakleen and used jb weld this worked well for about 6 months it just started leaking again but might be because i was driving about a hundred miles a day with hubs locked and transfer locked half the time at highway speeds

    marcus
     

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