A little research would yeild all your answers. Google is your friend. But since im bored:
Any 92 or newer TB, from a YJ or XJ will work.
I did it because my daily driver does about 200 miles of highway a week, and I always am looking for ways to increase power and fuel economy.
Ive had my 40TB on for 3 days now, and this is what Ive found:
-Low end torque get a huge boost. Your 0-40 range becomes significantly more powerful. Upper end doesnt gain a whole lot, but im still testing that. Seems to help me maintain 70mph uphill and into wind, my topend appears to be around 78 now (without wind assistance or hinderance)
-Shifting is smoother. Starting from a dead stop, I dont bog down anymore, and my shifts are smoother, because the engine can breathe easier and the RPMs dont drop off as quickly.
-Fuel economy is the big thing Ive still gotta watch. Before, when my gas gauge read 1/2, i usually had 120mi on the tripmeter or so. This is my first tank with the new TB, and im showing 140mi. Coincidence? possibly, Ill let you know.
But after doing this mod, I can say its the best 50 bucks Ive sunk into my Jeep. However, keep in mind that all this is on a vehicle running 33s, with a flex fan, headers, free flow exhaust, and a new motor (aka good compression) so your results could vary