well, just when i thought the work on my 92 'stang was ending, another big problem shows up. when replacing the fuel filter, i found a puddle of light oil. i searched around and right where drive shaft meets the rear axle, i found some oil dripping from there. it mustve been dripping for a while because it was a big mess. whats the problem here. will it cost some big bucks to fix it or is it a fast, cheap, painless job?