Whats you price range? http://www.midwestmustang.com carries them
and http://v6mustangstuff.com/drivetrain2.htm they carry them as well
Another option is getting a 8.8 rear out of a 99+ gt. they come with 3.27 gears already... not much of a difference between 3.55 and 3.27 plus the 8.8 is alot stronger.
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