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Old 06-23-2013, 10:19 AM   #1
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Transfer Case Fluid Change

I've been trying to get all my fluids changed after buying my TJ. I can't seem to figure out how to drain/refill the transfer case. Do I have to drop the skid plate to accomplish this? Also, any recommendations on t.c. fluids?

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Old 06-23-2013, 10:32 AM   #2
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The TC uses ATF, any ATF is fine as it isn't fussy about its ATF like an automatic transmission is. ATF+4 would be a good choice.

The drain & fill plugs are on the rear of the TC next to where the driveshaft connects. This photo shows it with the drain & fill plugs removed...


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Old 06-23-2013, 10:54 AM   #3
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Thanks, Jerry. I haven't figured out yet how to post pics in the threads like most other folks know how to do, but my 99 TJ Sahara appears to have a rather wide skid plate that covers the TC. It also covers the cat as well. It also appears that the TC is mounted to the center of the skid plate. Wish I could post a pic. Am I correct here or just a newbie mechanic?
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Old 06-23-2013, 10:58 AM   #4
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Just go look, you'll see the rear of the t-case is open & the skidplate does not have to be removed to change the TC lubricant. To avoid making a mess draining it since the skidplate is under the drain, just form a few layers of kitchen aluminum foil under the drain to direct the flow into your drain bucket.
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Old 06-23-2013, 11:08 AM   #5
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Thanks, and appreciate the tip on the foil as well.
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Old 06-23-2013, 11:22 AM   #6
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Another tip that I have read on here that makes sense: make sure to take the fill plug (top plug) out first then the drain plug to drain the fluid. That way if you have problems removing the fill plug you won't be stuck with an empty t case.
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Old 06-23-2013, 11:23 AM   #7
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One good tip I read is to make sure you can get the full plug off before you drain it! Seems logical to me haha
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Old 06-23-2013, 11:49 AM   #8
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Great advice. I'm also assuming that, given both plugs come off without problems, I'll need to pump the ATF out of the container in order to fill the TC, correct? I had to create a similar "drain skid" like Jerry mentioned when I drained and filled my manual transmission. I'm sure by doing it myself, it not only prevents a mess but also saves some $, let alone having the know how to do it next time. Thanks all.
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Old 06-23-2013, 12:40 PM   #9
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Quote:
Originally Posted by TJfunrun View Post
Great advice. I'm also assuming that, given both plugs come off without problems, I'll need to pump the ATF out of the container in order to fill the TC, correct? I had to create a similar "drain skid" like Jerry mentioned when I drained and filled my manual transmission. I'm sure by doing it myself, it not only prevents a mess but also saves some $, let alone having the know how to do it next time. Thanks all.
I haven't done it on my jeep yet, but in looking at it I do think you'll definitely need a pump to get the fluids in.

And you're gonna save a lot of money doing it yourself versus having some shop do it.
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Old 06-23-2013, 05:35 PM   #10
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Well the transfer case drain/refill went well. Found a device that attaches to a quart can which made filling easy. It did take a bit kore than 2.5 pints, however. I didn't want to overfill it though. Thanks for the help on this.
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Old 08-02-2013, 12:48 PM   #11
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My plugs are on pretty tight (05 lj with almost 100K and probably never changed) and I can't get them off. I'm a little nervous about cracking the TC if I apply too much force or tapping it. Advice please?

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