I had 2002 Windstar that did the same thing. Ford told me it was at transmission problem so I said fix it. $2500 later I had a new transmission with the same noise. I changed mounts, the harmonic balancer and the cradle rubbers all to no avail. Still had this vibration around 1400 rpms. I drove the car for 2 more years like that with no problem it was just sort of annoying.
Don't waste your money on a transmission cause that is what they will tell you need one next.
Turn the radio up lol :)
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Monday, November 1st, 2010 AT 1:46 PM