I don't think the pulley and tune would affect the tranny like that, for one thing they're pretty tough. There is a lesson here! You can't just throw parts at the car, it should be done systematically, with some sense of where you are going with it. Pulley and tune are usually done in conjunction with a DCAI and larger heat exchanger and manifold mods. Each change affects everything else so search the forum, all the info you need to do a good job is here.