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High pitched hum
My '70 is developing an intermittent high pitch hum. It's not a squeal. It is drive line related not rpm related. Doesn't matter what gear it's in (3 speed manual) or if the clutch is in or out. Doesn't do it under acceleration. More often hear it when slowing down. Front wheel bearings are good. Iam wondering about drive shaft bearings or u joint. Any input would be appreciated.
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