Manual valve bodies are what you want for a race car but for a street car why would you? Only reason I can think of is you don't have the knowledge to make a torqueflite shift correctly and I'm not knocking you, just saying. I've installed countless Trans-go TF-2 kits and never had a problem, although I know some little tricks that I do while rebuilding a TF that makes things work optimally. When I'm done them shift crisp and clean without overlap and at the proper rpm and do it all themselves or manually if I choose. I also do not prefer a "no low gear braking" valve body as that puts a big strain on the sprague which can lead to an explosion