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vibration noise?????

1K views 6 replies 3 participants last post by  mr.garrett72 
#1 ·
help f-350 crew cab 325000 miles standard tranny truck hits 50mph start getting a loud hmmmmming noise press in on clutch it goes away always same noise at exactly 50mph seems to lighten up after 55mph what could this be took it to several mech. one said clutch the other said clutch is finr because it doesnt slip just replaced a u joint that had slack in it but noise still there??????::dunno:
 
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