Question about 1992 Ford Mustang

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What causes a rear main seal leak on a 92 5.0 lx with 14,000 original miles? i did change to synthetic at 9,000 miles, I got the tranny out and Im about to put in a new seal. i want to make sure it dont happen again after putting it all back together.

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Believe it or not my boss put synthetic in his lightning f 150 and i put 3 rear main seals in it. a ford tec friend of ours said get that stuff out of there and had not leaked since. He said that synthetic is too slick for some vehicles.

Posted on Oct 15, 2010

  • craig bigham Feb 22, 2011

    Synthetic is thinner.Any time you switch over(high mileage or not) any weak point of a seal has potential to leak.When changing on a fox body mustang1986-1993 I would recommend installing a TEFLON rear main seal.Yes the do cost 4x more but do you want to do this again in 2 years?Yea after I did it twice I switch my 89lx to the teflon,that was three years ago-no leaks still,running full synthetic with 168k miles.
    P.S late model restoration,TX or summit racing both sell the upgraded seal

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