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Sounds like you MAY have a harmonic in the exhaust system. 2003s had this a bunch, including mine. Ford came out with a new pedestal for the turbo and that fixed many. For mine I just added a tip to the exhaust which moved the harmonic down the RPM band to where I never noticed it.
Roy
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2005 Limited, 6.0L PSD, 4X2, Mineral Gray, 3.73 LS. Excursion Build date 02-08-05 6.0L 2005MY Engine Build date 01-03-05 Huntsville, Ala.
2005 50th anniversary Thunderbird Red with all
options except hardtop.
Old Ride: 2003 Excursion 6.0 L March 2003 Build 73,000 with no significant issues.
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