Transfer Case front output shaft seal leaking after replacement

Discussion in 'GM Powertrain' started by Family Force 6, Mar 18, 2013.

  1. Family Force 6

    Family Force 6 Rockstar 100 Posts

    My transfer case from Hades situation continues to by my Achilles heel.

    Any ideas what would cause a front output shaft seal on a transfer case (NP 246) to go bad after being replaced? I just had the seal replaced about 3-4 weeks ago and the seal that was in there was supposed to be new when I got t-case, but it started leaking after a little time. Could there be something wrong with the actual output shaft/spline?

    It's back at the shop now that replaced the seal a few weeks ago, so I'm waiting to hear what they have to say.

  2. Family Force 6

    Family Force 6 Rockstar 100 Posts

    Well,it appears to have been leaking between the seal and the case. They used some silicone around the inside of the case as there were small pits and scratches and installed a new seal (this will be the third one).
    If this seal leaks I guess I'll start looking for another t-case. What a PITA this has been.
  3. SurrealOne

    SurrealOne Former Member ROTM Winner 1000 Posts

    Who manufactured the seal? I ask because I just had a rear seal replaced (with a NAPA part) .. and it leaked like mad despite being brand new. So, it was replaced -again- with an OEM part and there was no issue. Apparently this is common, as another forum user (dsfloyd) had run across the same thing.

    The OEM rear seal cost about 3x as much as the NAPA part ... but was visibly superior in quality.

    Perhaps your front seal issue is similar in nature? I'm merely speculating ... but if you've got a leaky front seal and it's not OEM, maybe give the spendy OEM part a look and if it's an obviously better seal ... perhaps spend the cash on it and put it in and see if it makes a difference?
  4. Family Force 6

    Family Force 6 Rockstar 100 Posts

    Not sure who manufactured the seal since the shop ordered it in. The shop did say that they occasionally get a bad seal, which based on your comment makes me think they don't use OEM.

    So far it's not leaking, but the last won't didn't leak until it had been in there for 3 or 4 weeks. We'll see.
  5. Family Force 6

    Family Force 6 Rockstar 100 Posts

    Ugghh. The leak is back. Started noticing it a couple months ago. It's not losing much fluid, but that t-case only holds 1.5 quarts. It's time for me to part ways with the 99 Suburban (going to purchase an 06 Tahoe 2wd in a few days).
    However, I do want to get this fixed for the next owner. Does anybody have a good source for the OEM seal? Also, will I need the special installer tool? I've read about people using sockets and hammers. I'm thinking a rented ball joint press might be the way to go.

Share This Page

Newest Gallery Photos