constant buzzing drone rear suspension '90 420sel

What is that noise coming from the rear suspension area? It's a constant buzzing/humming drone that is always the same pitch and rather loud (enuff to be annoying).

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Fuel pump ?

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Tires?
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Does it buzz and hum when you're driving? If so, look for something that fell and got caught. Think of baseball card tied to front fork of bicycle...
Waltaahh wrote:

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