Well I have been thinking... I have my 86 mustang I just got done with putting the 2011 5.0 in and I went with a built T56 that I had done with all D&D Performance parts. I am starting to consider going auto for the best 1/4 mile times. Im getting aggrivated with the stick because of clutch pedal issues and other little things. Plus running a stick at the track a lot tends to be a little brutal on everything else. I priced a 2011 6 speed auto and $5000.00 without converter is nuts! not to mention the wiring and computer tuning would be pricey. So with that said I have been looking at manual valve body 4r70w w/transbrake and tc lock up. My only concern is the gear ratios in the transmission are no where near as good as the the 2011 6 speed auto. I just wonder if the car is gonna feel slow with the 4r70w. I know these cars perform really well with the new auto but its probably only because it keeps it way up in the rpms the whole time. I've been reading on the termi cobra forums where people go to the 4r70 but the are most of the time a turbo car with tons of torque. Main thing is I dont want to slow the car down... I need opinions!