No change on removing the belts. My brother did comment on the engine moving when I switched into drive or reverse. I looked at it and noticed the same thing. However, I don't know if this is normal or not. It rolls to the passenger side when you shift into rev. or drive.
Heat shields appear tight, and skid plates where removed when I was last testing it, so it should not be them. The dipsticks at All Tune +Lube where the engine was installed say it's the rear diff vibrating; however they are not sure why the noise shows-up when revving in park.