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Old 05-28-2014, 06:32 PM   #1
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Diff oil change

I am changing the oil in my diffs this weekend, I have never changed gear oil before and I was told LSDs need a special additive... How would I know if I have an LSD? It is on an 03 sport that I got last month.

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Old 05-28-2014, 06:43 PM   #2
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Originally Posted by PHTanker View Post
I am changing the oil in my diffs this weekend, I have never changed gear oil before and I was told LSDs need a special additive... How would I know if I have an LSD? It is on an 03 sport that I got last month.
The LSD is called a trac-lok. I think it'll say something like that on your axle tag. I believe it's the tag with the gear ratio on it.

The additive is due to the fact that it is a clutch based limited slip as opposed to a gear based. It needs the additive in order to function properly.

You can find gear oils with the additive already in it. Find an oil that's designed for them and you won't have a problem. Cheaper oils are what you stay away from.

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Old 05-28-2014, 07:24 PM   #3
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The LSD is called a trac-lok. I think it'll say something like that on your axle tag. I believe it's the tag with the gear ratio on it. The additive is due to the fact that it is a clutch based limited slip as opposed to a gear based. It needs the additive in order to function properly. You can find gear oils with the additive already in it. Find an oil that's designed for them and you won't have a problem. Cheaper oils are what you stay away from.
Thx,
I understand the oil and additive, just needed to know how to find out if I had LSD or not....
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Old 05-28-2014, 07:37 PM   #4
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My `97 has a decal in the glove box--that is how I found that my TJ is Trac-Loc equipped. I confirmed by plugging my VIN into the Jeep website and the build sheet showed the Trac-Loc on the list. Do a little searching on this forum; there is a bunch of info on the subject. The carrier itself is visibly different as well.
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Old 05-28-2014, 08:57 PM   #5
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Lucas gear oil 80W-90 has the additive already in it.
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Old 05-29-2014, 09:08 AM   #6
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FWIW, I understand most major manufacturers are fully compatible with limited slip diffs--just read the bottle. I know that Royal Purple does not require any additive--although I do not use that product.
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Old 05-29-2014, 09:12 AM   #7
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Lucas gear oil 80W-90 has the additive already in it.
99% of the GL-5 gear lubes on the shelves have the friction modifier, it's hard to find one without it.
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Old 05-29-2014, 12:32 PM   #8
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I guess I have command-trac, does that mean no LSD? And if not will the oil with the additive hurt it?
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Old 05-30-2014, 08:37 PM   #9
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You can also jack up the rear end so both tires are off the ground. Spin one tire and if the tire on the other side spins the same way it has trac-lock. If if goes in the opposite direction, its an open diff and no special additive is needed.
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Old 05-30-2014, 09:00 PM   #10
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I guess I have command-trac, does that mean no LSD? And if not will the oil with the additive hurt it?
Command-Trac is another name for your part-time transfer case which has nothing to do with your rear axle. The limited slip differential your TJ may or may not have in the rear axle is called a Tracloc.
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Old 06-22-2014, 01:38 PM   #11
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Originally Posted by wheeliemay View Post
My `97 has a decal in the glove box--that is how I found that my TJ is Trac-Loc equipped. I confirmed by plugging my VIN into the Jeep website and the build sheet showed the Trac-Loc on the list.... .
WOW! Thanks for the reference! I went to the Jeep website and while I couldn't find the place to plug in m VIN and get the build list.... I registered (moparownerconnect.com) and clicked on the online chat option, had someone chatting with me within seconds.... and had a build list within about 4 minutes!!! I'm not sure that I will even consider a non-Jeep/Chrysler vehicle the next time I'm in the market to buy new.



Now, if only changing the gear oil can be so straightforward.....

-Jeff

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