Sell it and buy a manual.
-Manual trans DS setup
-Manual trans remote shifter linkages and a shifter
-Possible trans tunnel modifications
-Manual pedal assy
-Manual computer and either a tune or a PATS reflash
-Clutch/flywheel/hyd TOB setup
-Misc wiring stuffs
Like I said totally not worth it. Problem is selling a 3V for decent money is very hard these days. There is a GLUT of Mustang GTs for sale not to mention all the 2011+ V6s showing up for sale now and it being a much better/newer vehicle than the 3V.
2000 Mustang GT Steeda #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.