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  1. #16
    Join Date
    May 2017
    Post Thanks / Like
    My 3.91 has made noise since day one. 60-65mph and 75-80. Only with foot on throttle, as soon as you let off it’s gone. It’s a harmonic noise.

    Sent from my iPhone using Scat Pack Forums
    Likes Al Evans liked this post

  2. #17
    Join Date
    Aug 2016
    Post Thanks / Like
    I agree that it sounds like you've got a Wookie in the works.

    Seriously, though, I don't think it's in the drive train. I think it sounds like a large-ish, loose piece of sheet metal resonating at some rpm range with the exhaust system.

    But I like the Wookie hypothesis better!

    --Al Evans--

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