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Its very possibly either a broken flex plate or unbolted tork converter. My flex plate broke 3/4 of the way around and made intermiten growling noises. A different Ford I owned had only two tork converter bolts instead of three and one was loose and it made all sorts of ugly noises.

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Q: Whats wrong if you hear a inconsistent knocking in a 1994 ford aerostar from where the engine meets transmission?
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