I have a '87 Mustang with a 302 & AOD, with a 273 rear ratio . it also turns 1650 @ 75, it's a real dog! but a high top end. (mine is lowered 1 1/2"front, 2" in rear, for handleing) The dogest car I have every owned! I have check on the Mustang sites and they say that the best cure is gears, to drop to 373 or 411's with a AOD, for everyday driving, then add a stall if you want more out of the hole.
The same car & gears but a stick is night & day differance.

My .02 worth.
Pat