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Leaking Transfer Case Seal (Pics)

This is a discussion on Leaking Transfer Case Seal (Pics) within the Technical / Maintenance forums, part of the General Discussion category; I think I'm leaking fluid out of the back of my transfer case where the driveshaft "plugs" into the transfer ...

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    Didn't know what to type. Firestrike87's Avatar
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    Leaking Transfer Case Seal (Pics)


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    I think I'm leaking fluid out of the back of my transfer case where the driveshaft "plugs" into the transfer case. By looking at the pictures, does that look correct? If so, is there a tech article anywhere that explains with pictures how to replace on of those? I've searched for about an hour and found a bunch of 1 or 2 response posts that didn't help much. Take a look at the pictures and leave any comments that can help.


    This is how much leaked after I parked if and it sat for 24 hours. BTW, it was a piece of wood and it soaked in.

    1997 Z71 | 6" BDS | 35x12.5 M/T Baja Claws | 15X10 Classic II | Flowmaster 40 Series | 5.7 Vortec | 4L60E | 3:73
    Check out my Cardomain site for pics - http://www.cardomain.com/ride/1833894

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    Registered User spunger's Avatar
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    Re: Leaking Transfer Case Seal (Pics)

    Been there done that! Both the front & rear seal on my T-case leaked like that.

    The seals are easy to get at Napa/Kragen whatever. I have a NP241 but I think yours is different or I'd get you the part #. Just look for rear output shaft seal for the T-case.

    http://www.partsamerica.com/ProductD...e=1347&PTSet=A

    T-case outputshaft seal, $11.99 which seems right!

    You're going to want to get a seal remover tool. Look in the parts section. It's like a big claw hook thing. Works well for that rear seal. You pry that one out and then you get a big socket or a seal install tool and hammer it home and make sure it is seated flush like the current one. You WILL loose some fluid doing this, so take note how much drains out OR jack the rear end up but still you're going to loose some. Buy a quart or 2 of ATF to refill it and bam done.

    Also wipe off anything on the driveshaft slip yoke. Make sure it's smooth so it doesn't have a rust spot or something to tear the new seal.

    Everything always takes me a long time. I think I remember it taking me an hour? or so but that's the first time I attempted that. I imagine now I could have one changed within a half hour with clean up. Mine went out at 100k miles, some seem to go though them alot. But atleast they are easy to change.

    Good luck, I'll help where I can!
    1991 chevy k1500 4x4, 6" + 3" lift, Volant intake/delta flow 3" exhaust, TBI spacer, 35x12.50 BFG AT's and apline/JL/Infinity

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    Didn't know what to type. Firestrike87's Avatar
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    Re: Leaking Transfer Case Seal (Pics)

    Bump, any more opinions or replacement info?

    1997 Z71 | 6" BDS | 35x12.5 M/T Baja Claws | 15X10 Classic II | Flowmaster 40 Series | 5.7 Vortec | 4L60E | 3:73
    Check out my Cardomain site for pics - http://www.cardomain.com/ride/1833894

    2007 Honda CBR600rr | Pearl White

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    Re: Leaking Transfer Case Seal (Pics)

    I let the dealer do mine because I was short on time. They charged me like 60 bucks for parts and labor. Seems pretty easy to do though.

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    Didn't know what to type. Firestrike87's Avatar
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    Re: Leaking Transfer Case Seal (Pics)

    I have another question. After I purchased the new seal, it looks extremely simple. There is only like 1/4" of the seal that has to get pushed into the transfer case but there is already some sort of grease on the seal so do I have to add more? I would assume I just need to wipe some automatic transmission fluid on that 1/4" on the outside of it? Also, is there a specific orientation in which the seal needs to go in? There is a little notch on the metal housing and a small hole in the rubber housing and I don't know why they are there. It didn't come with any instructions like it said it was supposed to.

    The Grease

    The 1/4" that goes in the transfer case.

    The notch


    The Hole

    1997 Z71 | 6" BDS | 35x12.5 M/T Baja Claws | 15X10 Classic II | Flowmaster 40 Series | 5.7 Vortec | 4L60E | 3:73
    Check out my Cardomain site for pics - http://www.cardomain.com/ride/1833894

    2007 Honda CBR600rr | Pearl White

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    Registered User spunger's Avatar
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    Re: Leaking Transfer Case Seal (Pics)

    I don't know much about that hole, on my 700R4 there's no right way, you just tap it into the end of the housing until it is seated flush with the housing (the lip sits flush). You want it to be centered. Then you lube the seal up with some ATF and insert your slip yoke into it. Just make sure the slip yoke has no burrs or anything on it as it'll destroy that seal in no time.

    I used a large socket to tap it in, but the auto part stores sell a seal install tool that makes things stupid easy. Just make sure it gets in flush that's about the most important thing.
    1991 chevy k1500 4x4, 6" + 3" lift, Volant intake/delta flow 3" exhaust, TBI spacer, 35x12.50 BFG AT's and apline/JL/Infinity

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    Didn't know what to type. Firestrike87's Avatar
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    Re: Leaking Transfer Case Seal (Pics)

    Quote Originally Posted by spunger
    I don't know much about that hole, on my 700R4 there's no right way, you just tap it into the end of the housing until it is seated flush with the housing (the lip sits flush). You want it to be centered. Then you lube the seal up with some ATF and insert your slip yoke into it. Just make sure the slip yoke has no burrs or anything on it as it'll destroy that seal in no time.

    I used a large socket to tap it in, but the auto part stores sell a seal install tool that makes things stupid easy. Just make sure it gets in flush that's about the most important thing.
    Where do you the the transmission fluid on the seal? Just the red part on the seal? The inside or outside of it?

    1997 Z71 | 6" BDS | 35x12.5 M/T Baja Claws | 15X10 Classic II | Flowmaster 40 Series | 5.7 Vortec | 4L60E | 3:73
    Check out my Cardomain site for pics - http://www.cardomain.com/ride/1833894

    2007 Honda CBR600rr | Pearl White

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    Intake Gasket Specialist daleearnhardt01's Avatar
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    Re: Leaking Transfer Case Seal (Pics)

    Lube the ID of the seal where the yoke rides. Make sure the yoke is completely clean and free of any burrs etc or you will destroy the new seal. The hole is on the bottom of mine for what its worth although that black part has nothing to do with the actual sealing of the transfer case, only the red part does. The black thing is just a bushing. Dont worry about the notch in the seal it will have no affect on anything...
    Chris

    '98 Chevrolet K1500 Silverado Z71 RCSB Indigo Blue - Nelson Tuned 350 Vortec/4L60E/4.10 Lockright'd 14SF/Classic II's/285 BFG All-Terrains

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    Re: Leaking Transfer Case Seal (Pics)

    Put the hole towards the bottom....that way if the seal begins leaking, it'll drip out the bottom and you'll see it.....as dale said, be sure that the driveshaft yoke has no grooves or nicks in it to tear up the seal....

    On another note, it looks like the transfer case seal has been replaced once already.....have you checked your transfer case to see if it's OVERfull on fluid.....if it is it may be pushing it out the tailshaft. If the transfer case is overfull that most likely means the front seal is leaking and will need to be replaced, as it's pushing trans. fluid from the transmission into the transfer case.

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    Registered User J45p3r's Avatar
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    Re: Leaking Transfer Case Seal (Pics)

    Yep, hole goes down. Supposed to let any water, or whatever might collect in the black part to drain out.
    2003 GMC Sierra, ECSB, Z71, 5.3L, 285/75R16 BFG A/T KO's, K&N KIPK, Magnaflow Catback #15792, Wait4Me 87/89 Tune

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    Didn't know what to type. Firestrike87's Avatar
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    Re: Leaking Transfer Case Seal (Pics)

    Quote Originally Posted by strokercutlass
    Put the hole towards the bottom....that way if the seal begins leaking, it'll drip out the bottom and you'll see it.....as dale said, be sure that the driveshaft yoke has no grooves or nicks in it to tear up the seal....

    On another note, it looks like the transfer case seal has been replaced once already.....have you checked your transfer case to see if it's OVERfull on fluid.....if it is it may be pushing it out the tailshaft. If the transfer case is overfull that most likely means the front seal is leaking and will need to be replaced, as it's pushing trans. fluid from the transmission into the transfer case.
    It was replaced before when I got the lift put on my truck. It's a long story but the axle leafs were put in backwards and it pulled the driveshaft too far out of the transfer case and when they switch the leafs back around, they replaced the seal also because they said it was ripped. I checked the fluid a while ago and I filled it up to where it started to come out the fill hole about a year ago. Just the other day I noticed some fluid on the ground and took the pictures I posted up top. So I don't think it's overfull but I'll check tomorrow. How do I check if the front seal is bad?

    1997 Z71 | 6" BDS | 35x12.5 M/T Baja Claws | 15X10 Classic II | Flowmaster 40 Series | 5.7 Vortec | 4L60E | 3:73
    Check out my Cardomain site for pics - http://www.cardomain.com/ride/1833894

    2007 Honda CBR600rr | Pearl White

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    Didn't know what to type. Firestrike87's Avatar
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    Re: Leaking Transfer Case Seal (Pics)

    I did check my transmission fluid the other day and it didn't look low at all. I've never had to put transmission fluid in it. Am I correct it how I filled the transfer case? How would you check to see if its overfull? If I take that bolt out will transmission fluid pour out of it because the front seal is leaking trans fluid from the transmission?

    1997 Z71 | 6" BDS | 35x12.5 M/T Baja Claws | 15X10 Classic II | Flowmaster 40 Series | 5.7 Vortec | 4L60E | 3:73
    Check out my Cardomain site for pics - http://www.cardomain.com/ride/1833894

    2007 Honda CBR600rr | Pearl White

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    Intake Gasket Specialist daleearnhardt01's Avatar
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    Re: Leaking Transfer Case Seal (Pics)

    Yes if it is overfull it will pour out the fill plug.
    Chris

    '98 Chevrolet K1500 Silverado Z71 RCSB Indigo Blue - Nelson Tuned 350 Vortec/4L60E/4.10 Lockright'd 14SF/Classic II's/285 BFG All-Terrains

    '88 Chevrolet Blazer - 330HP 350HO/TH400/NP208/4.10 3/4 tons

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    Registered User rsalerno's Avatar
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    Re: Leaking Transfer Case Seal (Pics)

    Mine is slinging fluid everywhere, the dealer told me it was the seals, no big deal, already had them replaced once, So i had them do it. (three seals) Still leaks !!! Now they are telling me its my transfer case itself that has a crack on it. (i never use 4wheel drive)And I cant find the crack
    Rancho Suspension, 305's on MT Classic 2's, Blackbear, 4.11 gears

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    Didn't know what to type. Firestrike87's Avatar
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    Re: Leaking Transfer Case Seal (Pics)

    Quote Originally Posted by daleearnhardt01
    Yes if it is overfull it will pour out the fill plug.
    Well, I just went outside and removed the fill plug on my t-case and a few drips came out and thats it. I stuck my finger in there and there is fluid right up to the bottom of the hole. I'm gonna just assume that the rear seal might just be bad already. I'm gonna go ahead and replace it sometime this week and hope it stops dripping.

    1997 Z71 | 6" BDS | 35x12.5 M/T Baja Claws | 15X10 Classic II | Flowmaster 40 Series | 5.7 Vortec | 4L60E | 3:73
    Check out my Cardomain site for pics - http://www.cardomain.com/ride/1833894

    2007 Honda CBR600rr | Pearl White

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    Didn't know what to type. Firestrike87's Avatar
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    Re: Leaking Transfer Case Seal (Pics)

    Well I replaced the seal. I took the old one off and cleaned the piece that goes into the seal off and put some Automatic Trans Fluid on the seal and the shaft, tapped the new seal in and took it for a drive. I let it sit for about an hour and I'm still leaking fluid. Was I supposed to put some sort of grease on the new seal or did I do something wrong?

    1997 Z71 | 6" BDS | 35x12.5 M/T Baja Claws | 15X10 Classic II | Flowmaster 40 Series | 5.7 Vortec | 4L60E | 3:73
    Check out my Cardomain site for pics - http://www.cardomain.com/ride/1833894

    2007 Honda CBR600rr | Pearl White

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    Registered User spunger's Avatar
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    Re: Leaking Transfer Case Seal (Pics)

    http://i207.photobucket.com/albums/b...7/100_1598.jpg

    Is that the new seal? It looks like it's damaged. That part shouldn't have chunk-looking pieces missing from it.

    Just wondering...
    1991 chevy k1500 4x4, 6" + 3" lift, Volant intake/delta flow 3" exhaust, TBI spacer, 35x12.50 BFG AT's and apline/JL/Infinity

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    Didn't know what to type. Firestrike87's Avatar
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    Re: Leaking Transfer Case Seal (Pics)

    Quote Originally Posted by spunger
    http://i207.photobucket.com/albums/b...7/100_1598.jpg

    Is that the new seal? It looks like it's damaged. That part shouldn't have chunk-looking pieces missing from it.

    Just wondering...
    Ya thats it, what you are looking at is the grease already on it.

    1997 Z71 | 6" BDS | 35x12.5 M/T Baja Claws | 15X10 Classic II | Flowmaster 40 Series | 5.7 Vortec | 4L60E | 3:73
    Check out my Cardomain site for pics - http://www.cardomain.com/ride/1833894

    2007 Honda CBR600rr | Pearl White

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    i'm broke atvrider85's Avatar
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    Re: Leaking Transfer Case Seal (Pics)

    that leak looks farther foward then the seal i'd say get a couple cans of brake cleaner and clean the all the fluid off the transfer case is their a breather on top of the transfer case because if the case is over filled it may be pukeing oil out the breather

    by chuggernaut

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    Didn't know what to type. Firestrike87's Avatar
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    Re: Leaking Transfer Case Seal (Pics)

    The case isn't over filled. I took out the fill plug and the fluid is right at the bottom of the hole.

    1997 Z71 | 6" BDS | 35x12.5 M/T Baja Claws | 15X10 Classic II | Flowmaster 40 Series | 5.7 Vortec | 4L60E | 3:73
    Check out my Cardomain site for pics - http://www.cardomain.com/ride/1833894

    2007 Honda CBR600rr | Pearl White

 

 
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