I always glad to hear of a "happy ending" to a very costly adventure on a old car or truck. Its very surprising what a difference can make on a good tight trans. Its like a completely new car. Now did you have the stock Fordomatic rebuilt? I'm assuming thats what you have. Were they able to put any kind of shift kit or different torque converter in to make some crisper shifts?? You mentioned heavier thicker clutches.
Michael
MichaelSandy Valley, NV