what is the general going price for a 4r70w, used or new? mine has 115,000 on it and with me starting to do mods, i am thinking on a new one. it feels fine most of the time, but from time to time their is a hesitation in a shift or shudder. i am going to fluch it next month, but wondered what a new one will cost. i have seen new ones on ebay for like 530$ so from some company. just weighing options. also is the PI stallion t/c a recomendation as well. figure if i do the trans here soon i might as well do the converter.