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Unread 04-03-2008, 09:57 PM   #1
cherokeeswede
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Oil for transfer case

I had the rear differential wheel bearings replaced recently on my 2002 GC.

How would I know if the shop put in the correct oil for the transfer case? As I understand it, the oil has to be Mopar of a special type.

What happens if the wrong oil is used? Vibrations? More wear?

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Unread 04-03-2008, 10:10 PM   #2
tennesseewj
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Well it depends on what transfer case you have (hint - fill out your profile so people can check). If you have the Selec-trac (242) then it just uses ATF +4; however, if you have Quadra-trac or Quadra-drive (247), then yes you DO need dealer-only fluid. As far as telling the difference, I'm not too sure. Did you try asking the mechanic what he used?

If it is a 247 and the wrong fluid is in there, your progressive coupler won't like it too much, but as long as you don't ride around too long with it you should be okay
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Unread 04-03-2008, 10:11 PM   #3
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Please clarify... there are no wheel bearings in the T.C. so they shouldn't have touched the T.C.

If you asked them to change the fluid in the T.C., then ask them what kind they used. And yes, if you have the 247 (Quadra Drive/ Quadra Trac II) then you need 247 T.C. Fluid from the dealer.

If you have the 242 (Selec-Trac) then ATF+4.
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Unread 04-03-2008, 10:16 PM   #4
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Did they work on just your rear diff or your T-case? Or both? Which T-case do you have?

link- http://www.wjjeeps.com/service/maintenance_wj.htm#TCASE
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Unread 04-04-2008, 07:15 AM   #5
cherokeeswede
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They worked on the rear differential. I rememeber now that I also asked them to replace the oil in the transfer case. So I believe they are two separate items. It was a few months back.

I have the 4.7 liter Quadradrive so that would be needing the special oil. I did not do the repair at an authorized dealership, which is why I am wondering.

At the time of the repair I did ask if he knew which oil to use, and he seemed really sure of himself that he did, but now I regret not double checking.

I think I am going to replace the fluid myself today. Are there any Guides for doing this somewhere?

I will update my profile.
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Unread 04-04-2008, 07:21 AM   #6
JG_Canuck
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Quote:
Originally Posted by cherokeeswede View Post
I think I am going to replace the fluid myself today. Are there any Guides for doing this somewhere?

I will update my profile.
I'd check with the mechanic first to see if they did really use 247 fluid. If not, then change it... You should also inquire if they put the friction modifier in the rear diff when it was re-filled after service.

To change: open fill (top) plug. Put pan under TC. Remove drain (bottom) plug. When it's empty, put the drain plug in, fill it up to the fill hole (Take about 1.75 of the bottles) and put the fill plug in. You're done.
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Unread 04-04-2008, 07:34 AM   #7
cherokeeswede
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Thanks!

If I want to replace the oil in the front and rear differentials, are there instructions for this somewhere?

I have had many bad experiences with repair shops lately, I think I will just get all the fluids replaced my self. That way I now it was done right.
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Unread 04-04-2008, 07:52 AM   #8
JG_Canuck
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Use the wjjeeps link above to get the specs on the fluids you need.

Diffs are drained by removing the cover. You need to make a new seal using RTV when you re-install. Fill it up to the level of the plug. Quadra-Drive system needs friction modifier in the gear lube for the front and rear diffs.
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Unread 04-04-2008, 07:55 AM   #9
cherokeeswede
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What is RTV?
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Unread 04-04-2008, 07:59 AM   #10
JG_Canuck
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RTV silicone sealer/gasket former. Just ask for it at your local auto parts store.
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Unread 04-04-2008, 08:52 AM   #11
tennesseewj
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Quote:
Originally Posted by cherokeeswede View Post
If I want to replace the oil in the front and rear differentials, are there instructions for this somewhere?
Ask and you shall receive

http://www.getahelmet.com/jeeps/maint/diff_fluid/

It's a breeze even if you've never done it before
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Unread 12-05-2008, 10:53 AM   #12
swataz
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Resurrecting this to ask one question -

How much ATF+4 does the 242 take when changing it out?

Thanks!
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Unread 12-05-2008, 11:21 AM   #13
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wjjeeps.com has your answer.
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Unread 12-05-2008, 11:25 AM   #14
swataz
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wjjeeps.com has your answer.
Yes, indeed thanks. Looks like a little less than a quart and a half.
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