Get your Tune and then GEARS. No matter what tranny you have, the gear multiplys the Torque your car makes and sends it to the ground.
I am having a 4.10 installed in mine next month.
2006 Mustang GT in Torch Red
C&L Intake, Evolution Performance Tune, Borla Axle Backs, Hurst Shifter, 4.10's, JBA Long Tubes, Prothane Engine Mounts, Steeda UDPs, FRPP Charge Motion Delete Plates
84 Bronco, 302 C6 on 32 10.50's