Warm it up for 6 miles. Then 'drive' it on the jack stands.
Use a LONG steel rod to listen to different parts/areas of the trans to narrow down the spot. A long rod like a dowel or even a floor jack handle. Hold it to your ear like an automotive stethoscope.
Maybe a bearing is coming apart.
Tom
"Everyone should believe in something; I believe I'll go fishing."
-Henry David Thoreau
Men and fish are alike. They both get into trouble when they open their mouths
