go there and read about torque converters. They multiply torque thru the tranny at a higher ratio. an aftermarket one will reduce your 1/4 by .5-.6sec. get a tranny cooler with one. Get a PI Stallion 2800 stall if you get one.
Shift kit will help too. It firms up the shifts to where they are really quick. Might take off .05sec on your 1/4, but it does help the clutches in the tranny live longer.
moving to drivetrain.