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Old 04-29-2010, 09:28 PM   #1
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Limited Slip Diff

Ok so I'm planning on changing my front and rear diff fluid this weekend. I read the thread about using 80w90 fluid of any brand. But how do I know if I have limited slip. And of I do would both front and back need the LSD additive. And would the gasket need to be replaced if I take the cover off.

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Old 04-29-2010, 10:09 PM   #2
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Unless you tow I would use 75w90 -- Barely any difference, just personal preferance. Any decent gear oil already has additives for your basic LSD's also, you do not need to ad anything.

Gasket: Get yourself a tube of black RTV sealant. unless you want to waste money on a gasket every time. Make a small bead all the way around and bolt it up, then put your oil in!

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Old 04-29-2010, 10:09 PM   #3
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I changed my rear end grease because I had noise in the differential. Opened it up to see if anything was wrong. Didn't see anything so put the cover back on just use some good rtv silicone to seal it up. I used Valvoline lube with the addictive in it & it stopped the noise. The grease from the factory didn't have the additive in it so I know if the grease you use doesn't have it you will have trouble. I thought most all Jeeps were some type of rear self locking differential. Mines an 06 & it has some sort of friction discs inside. The discs have small ridges on them that kind of interlock. Maybe someone can explain it better than that.
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Old 04-29-2010, 10:51 PM   #4
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No additive are u sure. I read a thread on here that said if u had a limited slip rearend u had to put a LSD additive In it. Is that just for the older jeeps of what. Mine is an 03
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Old 04-29-2010, 10:56 PM   #5
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The addictive is already in most all top name brand lube. I used Valvoline & it came with it.
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Old 04-30-2010, 03:17 PM   #6
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If you have limited slip you have to get lube with it or add it. I just had mine serviced. If your not sure if you have a limited slip rear end call your local dealer with the vin#.
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Old 04-30-2010, 03:29 PM   #7
Knows a couple things...

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Most but not all gear lubes already come with the required friction modifier additive your limited slip differential requires. You can verify whether it does or not by looking on the bottle's back label where it will mostly likely have words to the effect "Compatible with limited slip differentials" or similar.

If your rear axle has a LSD, there should be a sticker warning of its presence in your glove compartment, or a steel tag on the axle's differential cover warning of the requirement for the friction modifier additive.

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