Tranny swap???
I have no experience with a TH400, (or a built 4l60e for that matter, still stock) but I think some of your choice will be dependant upon what power level you want. It doesn't sound like you are going too big, so I would say 4l60e to have an overdrive. But that also depends on if it is track only, or a street car. Not sure about the weight difference either.
Tell us more about your plans with the car, and hopefully someone can help you more.
I would say do a built 700-R4 so you don't have to deal with the expense of electronics. otherwise you'll need a harness and PCM to run a stock type 4L60E. Or......you could do either a 4L60E/4L80E w/a stand alone pcm and harness from someone like TCI. All depends on $ and what ur doin w/the car.
i sent u a pm
-dustin


