Transmission Squeek

[potshotscott]

Okay so last winter I swapped out my old 94 trans for a 2003 Mustang V6 transmission. The old one died. I recently had the car on jack stands to do a complete suspension rebuild. While down there I did motor mounts and trans mount. Now everytime I put the car in gear - forward OR reverse the transmission makes a somewhat quiet squeeking noise. No noise when the car is in park or neutral but there is a noise when in gear.

Any thoughts on this? Anyone experience this before? Car seems to run and drive better than ever....