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Transfer case leak!?! *PICS* Help!

Discussion in 'Technical Chat' started by TacoNL, Jul 18, 2008.

  1. Jul 18, 2008 at 9:23 PM
    #1
    TacoNL

    TacoNL [OP] New Member

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    Outside: TRD Exhaust, Skid Plate, Smittybilt Light Bar with 2 x Hella 500FF Driving Lamps and 2 x Hella 500FF Fog Lamps. Inside: Blu Logic Bluetooth Module
    I have a '98 Taco V6 4x4 that I've had for less than a week.

    Well today I noticed 2 drops of oil under the truck every time I had it parked for a half hour or more. There was always 2 drops a bit bigger than a quarter. I looked under the truck and noticed that the transfer case was covered in oil. *SEE PICS BELOW*

    It seems to cover the lower section of the transfer case and partially back towards where it joins the transmission. It's a dark oil as you can see. I have the trucked park now so I don't do any damage just in case the oil is low. However, it's shifting into 4WD and driving fine, and also driving in 2wd fine (aside from some sputtering when under load at 3K+ which is a suspected bad O2 sensor).

    Does any one have any opinions as to what my trouble is? Seal, multiple seals? I'm hoping it's not the whole transfer case being screwed! If it's the seals, what kind of labor time is involved in getting them replaced as well as approximate cost of the seals.

    On a another related note, does anyone know where I can download/buy a '98 Taco service manual?

    Thanks in advance for any help/input!

    [​IMG]

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  2. Jul 18, 2008 at 9:31 PM
    #2
    tacomaman06

    tacomaman06 Carolina Alliance: Lead, follow, or get the hell o Staff Member

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    Will
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    i would say clean all the oil residue off real good where you can see the case real good, then drive it a bit, then crawl under there and see if you can see where its coming from. have you checked the tightness of the drain and fill plugs?? could end up being a bad crush washer. hopefully, the case aint leaking.

    looks like you need to change that fuel filter too.
     
  3. Jul 18, 2008 at 9:35 PM
    #3
    tacomaman06

    tacomaman06 Carolina Alliance: Lead, follow, or get the hell o Staff Member

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    you can find the service manual here to download.......enjoy!!! by the way......welcome to tacomaworld!!!

    http://www.ncttora.com/fsm/
     
  4. Jul 18, 2008 at 9:36 PM
    #4
    humanoid

    humanoid bite me

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    See my post to you over on TN and get that frame looked at ASAP!
     
  5. Jul 18, 2008 at 9:37 PM
    #5
    tacomaman06

    tacomaman06 Carolina Alliance: Lead, follow, or get the hell o Staff Member

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    yeah......definitely get that looked at. toyota may buy that back from ya if the frame is rusted thru!!
     
  6. Jul 21, 2008 at 7:12 PM
    #6
    wushaw

    wushaw Well-Known Member

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    It looks like the leak is comming from the top side of the transfer case, check your fluid level, it could be over full and discharging it through your breather.
    Worse case would be the the case halfs are leaking which would require splitting and re-sealing.
     
  7. May 20, 2013 at 9:50 PM
    #7
    Scottyrocco16vdub

    Scottyrocco16vdub Active Member

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    REally sorry to bring this back from the dead but my taco is having the same leaks... Never had a leak before, noticed a weird noise on a trip, found the transfer case oil level to be super low. The noise didnt go away after I filled it. I did notice the carrier bearing boot was ripped and had quite a bit of play. On my way back from the trip noticed a puddle under my truck from oil in the same places. Did the vibration of a bad carrier bearing mess something up? I have ordered new U joints and carrier from rock auto and should have it tomorrow to replace those, but is my transfer case/tranny toast???
     
  8. May 21, 2013 at 2:31 PM
    #8
    Lumpskie

    Lumpskie Independent Thinker

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    ^The t-case usually leaks from 1 of 2 places.

    First is the output flange for either the front or rear driveshaft. Clean up the rig, drive it around and look to see if the oil is coming from the spot where your driveshafts connect.

    The Second place is from the RTV gasket inbetween the two halves of the t-case. Again, clean it up, drive around and look at it.

    If it's coming from where the driveshafts connect, there are inner and outer seals you can buy and replace. You don't need to remove the t-case for this job. Just drain the oil, pull the driveshafts and remove/replace the seals.

    If it's from inbetween the to halves of the t-case, you need to remove it. Then take the bolts that hold the halves together out (6 or 7 I believe) and pry the case apart. It will only pull apart about a half inch or so. Be careful not to displace any of the internals. Clean all the old RTV off and lay down a heavy bead of "The Right Stuff". Close the case and torque. Replace the case and let it rest before refilling with oil.

    After that, you should be good to go!
     
  9. May 21, 2013 at 3:43 PM
    #9
    Scottyrocco16vdub

    Scottyrocco16vdub Active Member

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    Excellent! Thanks for the help! I am very glad to hear I can change those seals with out removing the t case. I cleaned it up all yesterday and I am about to go check it out now. Does it have a vent? is there a chance I might have over filled it?
     
  10. May 21, 2013 at 3:51 PM
    #10
    nj636

    nj636 Hub Master General

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    if you have to pull the t-case it really isn't all that bad. like everyone is saying though, clean it, drive it, get under there and follow the trail of gear oil.
     
  11. May 22, 2013 at 5:17 AM
    #11
    nj636

    nj636 Hub Master General

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    sounds like you speak from experience? :rolleyes:
     
  12. May 22, 2013 at 5:28 AM
    #12
    maineah

    maineah Well-Known Member

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    Looks to me that is been apart before and is leaking at the case half's.
     
  13. May 22, 2013 at 3:46 PM
    #13
    Scottyrocco16vdub

    Scottyrocco16vdub Active Member

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    Well I have had it for a year and its never dropped a drip. but maybe it had leaked it all out... might have bigger issues... I want an 05+, I wish i wasnt poor and have no credit
     
  14. May 22, 2013 at 7:27 PM
    #14
    nj636

    nj636 Hub Master General

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    your looking at the OP's pics
     
  15. May 22, 2013 at 7:30 PM
    #15
    nj636

    nj636 Hub Master General

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    did you ever hop under an see where it's leaking from? post pics
     
  16. May 22, 2013 at 9:42 PM
    #16
    Scottyrocco16vdub

    Scottyrocco16vdub Active Member

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    My transfer case and transmission looked identical to those pictures. I cleaned it all off on monday but it hasnt leaked since. It seems like a while driving thing. I have the first half of the rear axle out now to change the carrier bearing so I won't be able to drive it for a few days until I get the parts... and an impact wrench
     
  17. May 25, 2013 at 8:46 AM
    #17
    Scottyrocco16vdub

    Scottyrocco16vdub Active Member

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    Well I got the new carrier bearing in. Drove around for about 15min, no load or hills, had no leaks. I am taking the dirtbikes to a place this morning a bit farther away so we will see if she leaks on that venture
     
  18. May 25, 2013 at 11:17 AM
    #18
    nj636

    nj636 Hub Master General

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    maybe theres no oil in it to leak out :notsure:
     
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