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Old 12-13-2010, 06:30 PM   #1
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Maintence Question

I am gonna go ahead and change all the fluids in my jeep because im not sure if its ever been done.I know what to use in the front & rear axle and transfer case but my owners manual says if I have the trac lock differential that I have to add a additive Do all 4.0,s have trac lock?

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Old 12-13-2010, 06:36 PM   #2
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No, not all have it. Is the tag still attached to one of the diff cover bolts?

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Old 12-13-2010, 06:43 PM   #3
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No, not all have it. Is the tag still attached to one of the diff cover bolts?
No I don,t think it is.I can check tomorrrow though.
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Old 12-13-2010, 07:26 PM   #4
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I am pretty sure most do not have it as it was an option, but get a build sheet from Jeep and you will know for sure if you have one.
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Old 12-13-2010, 07:39 PM   #5
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Let's say it does have one or in my case a locker. Would Mobil 1 synthetic work?
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Old 12-13-2010, 07:40 PM   #6
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I am pretty sure most do not have it as it was an option, but get a build sheet from Jeep and you will know for sure if you have one.
Ok thanks!Any recommendations on what brand fluid to use in the front and rear axles?
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Old 12-13-2010, 07:41 PM   #7
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Trans fluid

I don't think the additive will hurt anything but not using it and you need it certainly will. It will chatter and let you know if you need the additive.
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Old 12-14-2010, 01:14 AM   #8
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I like mobil 1 synthetic and it will be fine for any tj rear, but if you have a clutch type limited slip, you must add a friction modifier. Actual lockers dont need anything more than the gear oil.
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Old 12-14-2010, 04:04 AM   #9
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The easiest way to tell if you have the Trac loc rear is to jack up the rear end making sure both wheels are off the ground. Rotate one of the tires forward, if both wheels turn the same direction you have the Trac Loc limited slip, if they turn in opposite directions or only one turns you have what is called an open differential. If you have Trac Loc you need a friction modifier regardless of the oil that you use, any auto parts store will have some and they will know what you are talking about when you ask for it.
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Old 12-14-2010, 04:05 PM   #10
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The easiest way to tell if you have the Trac loc rear is to jack up the rear end making sure both wheels are off the ground. Rotate one of the tires forward, if both wheels turn the same direction you have the Trac Loc limited slip, if they turn in opposite directions or only one turns you have what is called an open differential. If you have Trac Loc you need a friction modifier regardless of the oil that you use, any auto parts store will have some and they will know what you are talking about when you ask for it.
Ok thanks for the info.
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Old 12-17-2010, 04:55 PM   #11
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my build sheet i just recieved today says i have command trac is that the same as trac loc
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Old 12-17-2010, 05:06 PM   #12
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Quote:
Originally Posted by lashleyftl
my build sheet i just recieved today says i have command trac is that the same as trac loc
No, command trac is the name of your 4x4 system.
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Old 12-17-2010, 08:46 PM   #13
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Ok I don,t have trac lock.So I plan on changing all the fluids tomorrow and I have one more question does the jeep need to be warm or does it matter.Im changing the manual trans fluid also.
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Old 12-17-2010, 08:49 PM   #14
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I prefer warm because any "solids" will be suspended and will run out with the oil, and the oil will be thinner and drain quicker and more completely.

Not really that big a deal tho.
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Old 12-17-2010, 09:39 PM   #15
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I have heard bad things about full synth in our rearends. Doesn't protect as well as Dino.
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Old 12-17-2010, 09:54 PM   #16
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i put limited slip additive in every diff no matter what ive never had one go out on me or my customers even with reg 80w/90 and mobil1 75w/90 and the mobil1 75w/140
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Old 12-17-2010, 09:58 PM   #17
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on the manual trans yes it does need to be warm to get the best results
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Old 12-17-2010, 10:01 PM   #18
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and if u need specs on diffs or others call jeep dealer with vin ask for parts give ur vin and they should be able to tell u what ever u need

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