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My stepfather's truck has a Dana 60 limited slip rear axle with 3.73 gears. Today, when stuck in the snow(common in central New York), I noticed that only one tire was spinning, meaning that the limited slip diff isn't functioning as it should. Does this mean that the clutch packs in the diff are shot or would the truck not move at all if this were the case? I've never seen what happens when a limited slip wears out... does it act like an open diff?

Thanks for any input.


Dead clutch pack? Maybe. Or, it could be as simple as the WRONG GEAR LUBE!


There's a gazillion lubes out there, and not all of them have the friction additives for LSDs.

Try some different grease. I think that you're looking for the API Spec GL-5.

Or, you can buy the friction additive from many parts stores.

Try that first.

Anyone else know for sure? Zuk? 4Crawler? Anybody?