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As others have already pointed out, it depends on how/where the car was driven. I have a stock-stacked Traction-Lok with 167xxx miles on it currently that is still working great. I have another one with ~17xxx miles on it that is probably going to need a rebuild by 25k.A stocker is good for 90k miles max. That's the mileage our Crown Vic had when it only would leave the right tire mark on a burnout. It still felt like the left tire was helping, just not enough to leave a mark.