Dirty Transfer case Fluid Just changed-leaking from Manual Transmission??? - JeepForum.com
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Unread 11-23-2008, 10:33 PM   #1
ctsvmongo
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Join Date: Nov 2008
Location: omaha
Posts: 9
Dirty Transfer case Fluid Just changed-leaking from Manual Transmission???

Help me please. I am new to Jeep ownership. I have a 92 Wrangler 4.0 5 Speed Manual.


Last edited by ctsvmongo; 02-18-2009 at 10:31 AM.. Reason: updated
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Unread 11-24-2008, 09:08 AM   #2
idaholtby
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1991 YJ Wrangler 
 
Join Date: Apr 2008
Location: Meridian, Idaho
Posts: 2,554
Your ATF fluid turned dark so quickly because the inside of your newly acquired transfer case had a lot of dirt/sludge in it. Drain and refill the case with fresh ATF. Run it for a couple hundred miles and drain and refill again. Repeat until the transfer case fluid stays clean. ATF is a real good cleaner and it is dissolving the gunk that is in there. It is either repeated flushing, or tear it down and do a full rebuild/clean. As far as the tranny and transfer case fluids mixing, it is highly unlikely. Both units have their own seals and if either were to leak, it would gravity drain through a weep hole at the bottom and not make it between units.
Like you discovered, the transfer case tail shaft seal is a common leaker. You can replace it and clean/deburr your slip yoke for a semi-permanent fix. By design it will eventually leak again. Permanent fix would be to do a SYE conversion, but these are spendy.

As far as the tranny fluid, stick with GL-4 gear lube. GL-5's have sulfur additives that attack the brass synchros.
Being that you are in Nebraska, I would recommend a synthetic such as Redline MT-90 or Penzoil Synchromesh. These type fluids greatly reduce the stiff shifting in cold weather that these transmissions are known for.
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Unread 11-24-2008, 12:25 PM   #3
ctsvmongo
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Thanks for the help. I can use that if I ever have any problems.

Last edited by ctsvmongo; 02-18-2009 at 10:31 AM..
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Unread 11-24-2008, 02:42 PM   #4
idaholtby
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1991 YJ Wrangler 
 
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Location: Meridian, Idaho
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It is worth a try. The worst thing that could happen is that it still leaks and you are only out your time.
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Unread 11-24-2008, 03:25 PM   #5
ctsvmongo
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Thanks again, Nice Jeep by the way. Love the Hellcats(?)
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Unread 01-23-2009, 08:44 AM   #6
crzylgzz
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2011 JK Wrangler 
 
Join Date: Dec 2008
Location: NYC, NY
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Quote:
Originally Posted by idaholtby View Post
It is worth a try. The worst thing that could happen is that it still leaks and you are only out your time.
wait wanna run that part about the tranny fluid by me again. Ive been wanting to drain and replace my manual tranny fluid for some time but> i havent the foggiest idea how...

So your saying the stock recommended fluid normally used is no good, cause it has a tendency to eat away at the brass synchro's..

ok where do i begin on the dump and pump?? I looked everywhere for a drain, fill plug on my tranny, no luck..

please advise.
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