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Maybe torque converter chattering going into lock up, when did you change fluid last etc?
Sound speed related not rpm so maybe driveshaft carrier bearing or rear diff bearing where yoke goes in?
Take a friend for a ride or let them drive and see if you can narrow down at least what part of vehicle it's coming from?
As you can tell I'm just shooting in the dark but hope this may help you find the issue. Good luck!
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E99 F350 Ext. cab Long bed, single wheel 2x4
Riff Raff 6637 intake, FRX and HPX,
Dieselsite boostfooler, factory tech valvebody, filter system,
Local custom trans build - BTS in near future,
Derale cooling pan and trans cooler,
Mbrp 4" turbo back
Ts 6 pos chip - TW tunes coming soon,
Guzzles hutch and harpoon mod with lift pump and racor filters
Blank pedestal with moded exhaust port
Afe rear end cover
Callahan drilled and slotted rotors front and rear