Thank you for your responses. I don't mean to sound angry. I have used the "search" function on here many times, and have probably read everything ever written on here about torque converters, gear ratios, transmissions, etc. I don't have a photographic memory. My transmission works as its supposed to, but I know it needs a new torque converter. It got the shudder problem a while back, and it just seems rather sluggish. It also makes a rather annoying clunk, which I believe to be a problem with the center support. But back to matter at hand.
I have looked at car-part.com, and the average price for a used transmission seems to be about $400 to $500 for ones with over 100k miles. I don't see how its going to be cheaper to spend $500 on a used peice of junk and be that much in the hole before I even start buying parts. If there's some significant difference in the cases, perhaps I am misinformed. But I don't really think I need a fancy circuit board instead of individual wires, don't see the point of "upgrading" the solenoids if they work fine as is, putting in extra friction plates, or whatever. My current train of thought is to put in a Mark VIII or Marauder type converter and flexplate, rebuild the transmission in its stock form, and maybe get 3.73 gears. Will that make me the fastest kid on the block? I doubt it. But if I want to keep my Thunderbird, I'm going to have to do something. Maybe I should just sell it and get a Honda Civic, preferably one with a large tailpipe.