Good point Firebob. In fact, my friend who has an 80 T/A just went through this whole conv. from the original 4-speed to a 6 speed. The car is finished however, he makes the same point. He would have to drive the car 12k miles per year for the next 5 years to make up the difference etc. All in all, he is not happy with the conv. and the money spent to do so...