Torque converter crack

There's nothing wrong with a cheap converter in a daily driver. But you want to cheap out on fixing it then want to buy a hundred dollar shift kit? Makes no sense. With the history of many leaks, the clutches are probably fried. With much material in the pan, take out the pump and front drums at least and make sure the clutches are at least good used. But these transmissions can take loads of contamination as long as you use a gauze filter, and not a metal screen. And your incorrect shifts are probably caused by clutch and band wear. Rebuild kits include lots of parts not necessary for what you want, but you should take it apart before you go buying anything; including a converter. For instance, you may or may not need steels. You might need hard parts. Don't assume anything without seeing everything.