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Discussion Starter · #1 ·
2000 Durango 4x4 4.7L
9.25 rear differential with anti spin (lsd)

I was changing the sensor in the rear differential and the sensor had some sludge on it so I decided to change the fluid. Fluid had some metal dust in it and there were a few pieces of metal laying in the bottom. The metal pieces looked like clips for the passenger side clutch which are missing. All of the gears appear to have no damage.

My question is how important are the clips and how hard is it to replace them?
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It's not uncommon to find "metal dust" in the diff oil. Limited Slip differentials have clutch packs that over time will wear and leave material in the oil. What is of concern is the pieces of metal you found at the bottom of the housing. By the photo, it looks like an ear off of one of the clutch pack plates has broken off. The diff will still work but I suspect the LS isn't functioning to it's fullest potential. Limited Slips can be rebuilt and new clutch packs installed, but if you don't know how to "set-up" gears, you could destroy the gears in less than a hundred miles. Take the truck to a mechanic familiar with setting up gears and pay whatever they ask. It's not a job for a novice.
One more thing, if you decide to change the gear oil, in the future, LS diffs require a friction modifier added to the oil. Without it, the diff will chatter and make strange noises as you drive.

Ed
 

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One more thing, if you decide to change the gear oil, in the future, LS diffs require a friction modifier added to the oil. Without it, the diff will chatter and make strange noises as you drive.

Ed
Don't most good synthetic differential oils have the friction modifier already built in?
 

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No. most cars and light trucks do not come with a limited slip differential, so they do not need a friction modifier. Those that have a LS need the friction modifier separate from the oil so as to adjust the amount you need, not all LS units are the same and require different amounts of friction modifier added

Ed
 

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Discussion Starter · #5 ·
I refilled with Royal Purple and 4oz of the friction modifier. The Royal Purple is supposed to already have a friction modifier but I would rather be safe.
 

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The Mobil 1 gear oil I put in my diff was also supposed to have LSD additive already in it, but I added a bottle of Mopar friction modifier just to be safe. It sure won't hurt anything.
 
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