transfercase leaking (Full Version)

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transfercase leaking

  

greensilverado -> transfercase leaking (3/17/2008 4:34:51 AM)

hello all,  I have a 2002 chevy silverado 4x4 8'bed standard cab 4.8 with 167,000 miles on it.  my transfercase started leaking recently near the drive shaft (output shaft according to the chevy dealer).  I replaced the shaft seal and the yoke (short piece of splined drive shaft that goes into the transfercase) with a new one.  according to my dealer it is a new and improved unit.  I also replaced the breather hose check valve.  when replaceing the 3 pieces mentioned i drained the fluid and replaced with fresh new dexron iii fluid.  it still leaks like a sive.  anyone else have this issue??   i feel like i just wasted about 250.00 since i replaced both ujoints while i was under there.  could it be the bearing that the spline rides on?

  
northey87 -> RE: transfercase leaking (3/17/2008 10:42:04 AM)

Welcome to the forum!!! Someone here should be able to help, hang in there.

EuroGoldLS -> RE: transfercase leaking (3/17/2008 1:36:37 PM)

I doubt the possibility thebearing is causing the leak. Check the way you put the seal and o-ring back in and make sure it hasn't split.

gofshn -> RE: transfercase leaking (3/17/2008 4:36:24 PM)

i had a similar problem in my z-71, i went thru and replaced several output shaft seals.  i added uv dye to my fluid in the case and found that it was actually leaking at the press fit from the shaft to the yoke.  i never have seen a leak of this type before, kinda stumped me for a few weeks. i assume it is the np241 transfer case.

greensilverado -> RE: transfercase leaking (3/19/2008 5:18:45 AM)

thank you guys for your replies.  i think i will buy another seal and apply sealer to the seal where it mates with the transfercase (o.d. of seal to i.d. of transfercase).  i know my fluid level was high, but not enough to cause this kind of leak.  i may call the chevy dealer to find out what they do to fix it. 
this is a pain since i installed a new yoke w/ a new seal.  this is very frustrating.  i am very gentle when i slide the shaft thru the seal and have never had an issue like this.

TransAm Man -> RE: transfercase leaking (3/19/2008 2:41:22 PM)

Something tells me you didn't put the seal on right. Did you try wiping off the fliud and pinpointing exactly where it was leaking from?

greensilverado -> RE: transfercase leaking (3/27/2008 7:13:23 AM)

i replaced this seal before at 110,000 miles with out any issues of leakage (i replaced it when the u joints went bad).  I have a seal driver i use that seats the seal evenly.  I always wipe the area down with brake cleaner and a clean rag before applying new seals.  I'm really stumped.  I think there maybe a venting problem.

greensilverado -> RE: transfercase leaking (4/30/2008 3:58:30 AM)

well after a lot of searching and anther seal I found that i have a hole in my transfercase.  this is caused y the pump rubbing a hole in the casing.  

there's a lot of info on this at thedieselplace chevy forum.   search for pump rub.  so it was never the seal in the first place


greensilverado -> RE: transfercase leaking (4/30/2008 4:00:19 AM)

here's a link to get started

http://www.dieselplace.com/forum/showthread.php?t=234405

  

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