+1 on avoiding the 4L60E to avoid the hassle on the electronics. Get a Turbo 700R4; if I remember correctly, the post '93 are the best from the factory. The TV cable is crucial, it is not a kick-down cable as in TH350 or TH400, if you do not adjust it well, the trans will die very quickly. The OEM cable and carb bracket (junkyard) are very easy to set up, or look into the aftermarket. You also need something to lock/unlock the converter (bow tie overdrive.com). And of course probably a new driveshaft. A lot of 700R4 have an electronic speed drive on the tailshaft housing: if you want to connect a speedo cable, swap the tailshaft housing for one from an older 700R4 with cable drive. And at the same time, change the speedo gears to get an accurate speedo.
