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Re: 67 front drum harmonic whine issue
You might try a very light turning pass across them to change the texture of the inside of the drums....but a harmonic vibration is pretty common with drums, that is the reason for the coils spring that wraps around the rim of some of the early vehicle's drums....and why the machine shop may put one on during the turning process. It can "ring" while being cut too.
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Originally Posted by Longhorn Man
As for reading directions...
The directions are nothing but another man's opinion.
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Learn from the mistakes of others, you won't live long enough to make them all yourself...
Bad planning on your part does not necessarily constitute an instant emergency on my part....
The great thing about being a pessimist is that you are either pleasantly surprised or right. 
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