1990 Ford Explorer Problem

I was wondering if some one might have any ideas as to what might be causing the thumping noise coming from my transmission when I shut it down. The
sound will sound like something might be bumping inside and deminishes in about a couple minuted after it is shut down... if any one might have any ideas what it might be other than a missing cat knocking on the floor trying to get my attention, let me know what you think.
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It is probably something cooling off. Think of the way hot water pipes make sounds when they heat up and cool off as waters goes through them.
Jeff
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