Still hear a bit of a clunk shifting into 2nd sometimes on mine. No change with my new drive shaft. However I had a vibration on the stock ds when reducing speed around 2300-2500 rpms that was annoying. That almost completely disappeared with the new aluminum ds.
2013 Mustang V6 w/Premium Package, Comfort Package (Yay pony lights...), Appearance
Mods: Airaid CAI, Ford Racing 3.73 Gears, Aluminum 1-pc driveshaft, American Muscle Staggered Black Bullitt 18" wheels, Bama Tunes, Ford Performance engine cover, JLT Air/Oil Separator, Boss 302 Strut Tower Brace