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rear differential leak

  1. 4

    Leaky rear differential. Big problem?

    I have a 2001 explorer sport and my rear diff is leaking right at the pinnon seal. I don't know how long it has been like this but it is pretty bad. It is all over the bottom, gas tank, diff, and drive shaft. When I park it for more than a few days, a puddle forms. Is it serious or should I get...
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