I believe it was a Factory Tech kit, included plate and accumulators/springs. My Xcal III also has capability to increase pressure and change shift points. I'm running orginal torque converter which is getting long in the tooth. At 140,000 I'm gathering info on rebuild. 4R70W (AODE) is a good trans and there are a lot of guys drag racing Mustangs with them. The 4R100 is an inherently stronger trans, but I would not say that you have to have one with an Eaton or else.
http://www.factorytechtransmissions....PROD&ProdID=20