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Drumming sound help


Ron Dame

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Well I would have someone ride along in the back seat to see if they can spot the location of the noise. If not I would jack up the rear axle to get the rear wheels able to spin, safely with some stands, and run it through the gears with someone able to move around the car listening for the location. Got to start somewhere and this would maybe give you some idea. My 1991 convertible has zero external noises and rolls like it is on rails.

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OK thanks. I had not considered U joints or bearings, honestly I am thinking more a larger panel that was resonating. So I will chack all of this out and get back with everyone. Thanks!

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Since it only does it at a specific speed I would agree with the driveshaft balance theory.  Sometimes vibrations balance out after a certain point...something like exhaust would simply change tone or get worse as it strikes the frame.

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I worked on a 76 that had a vibration, and it turned out to be the tail shaft bushing where the driveshaft yoke slides in and out.

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  • 2 months later...

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