78 Lincoln mark V 460. Noise when accelerate

1978 LINCOLN MARK V
157,000 MILES
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KOTZBACH
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Hello,
I hear a deaf noise as a humming when I accelerate. All depend the range fo speed or rpm. When cruising, the noise can be heard between 35 to 60 mph. When starting, I can hear the noise if the car need force ( for exemple in a slope or a hill ).Ohterwise, the faster I go, the car make no more noise...Thanks for all. (and excuse me I write as I can I'm from France)
Apr 3, 2012 at 12:45 PM
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HMAC300
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have apro look at this we can't hear it to give a good diagnosis
Apr 3, 2012 at 2:42 PM
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KOTZBACH
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I can try to be more clear.
There is no noise when iddle. On D position appears the noise during acceleration, certainly a relationship with torque. The noise/vibration seems to come from the right of the car at the level of the front passager . Thanks if you have some clues.
Apr 6, 2012 at 11:42 PM
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HMAC300
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it may be a broken shield from the cat converter if it's more like a rattle. it cold also be the humming that you hear.other than that i really couldn't say
Apr 6, 2012 at 11:44 PM