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friction modifier

  1. S

    Rear Differential: Friction Modifier with Synthetic Fluid?

    To Add, or Not to Add. That is the question. I've had all kinds of issues with my '02 XLT's rear differential (3.73 Limited Slip) over the years, including a clutch pack replacement and partial rebuild. I'm kind of babying it now, changing fluid every 30K miles or so. I bought some Royal...
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