I have this noise that comes and goes. Happens app. once a month, and lasts for a few days. It comes from the rear, and is a clicking sound that I can't narrow down to a specific location, but some help from you guys may help me narrow it down. It can only be heard at acceleration, and doesn't come in till the end of 2nd gear. Remember, I know it is deffinately coming from the rear, and not the tranny. Thanks in advance for any recomendations.

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1989 300E 144K