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Old 03-17-2008, 07:34 AM
Join Date: Mar 2008
Posts: 5
Default transfercase leaking

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?
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Old 03-17-2008, 01:42 PM
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Default RE: transfercase leaking

Welcome to the forum!!! Someone here should be able to help, hang in there.
'95 1500 Silverado, 350, flowmaster Force II exhuast, S&B CAI.

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Old 03-17-2008, 04:36 PM
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Default RE: transfercase leaking

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.
Brent Evans

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Old 03-17-2008, 07:36 PM
Join Date: Feb 2008
Posts: 2
Default RE: transfercase leaking

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.
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Old 03-19-2008, 08:18 AM
Join Date: Mar 2008
Posts: 5
Default RE: transfercase leaking

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.
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Old 03-19-2008, 05:41 PM
Join Date: Mar 2008
Posts: 137
Default RE: transfercase leaking

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?

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Old 03-27-2008, 10:13 AM
Join Date: Mar 2008
Posts: 5
Default RE: transfercase leaking

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.
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Old 04-30-2008, 06:58 AM
Join Date: Mar 2008
Posts: 5
Default RE: transfercase leaking

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

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Old 04-30-2008, 07:00 AM
Join Date: Mar 2008
Posts: 5
Default RE: transfercase leaking

here's a link to get started
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1500, 2000, 2002, bearing, case, chevy, drive, leak, leaks, output, replaceing, shaft, silverado, transfer, transfercase, ujoints

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