" My advice: don't build for a number. Build a car to do what you want it to do. Building for a number becomes a constant source of solving one problem and creating two more. " - Husky44
Your reading his signature line. You'll see all kinds of stuff in signature lines that has nothing to do with the response he gave you on the transmission. Read the part at the top, above the signature line.
As for the transmission problem. When you serviced it did you check the fluid in neutral? If you checked it in park it's way low on transmission fluid cause Chrysler's dump fluid back into the pan in park, you have to check them in neutral to get a correct reading. And as PoisonDart pointed out you absolutely have to have the throttle pressure linkage (what your calling the kickdown linkage) hooked up and adjusted properly or you'll fry the trans in short order. What you described is clutch plate chatter. No band (front or rear) affects take off to much extent. Clutch plate chatter is either low fluid, dried out seals, or worn out clutch plates. If it was driven very much at all without the throttle pressure linkage hooked up the trans is most likely toasted