727 Line Pressure VB + Light Governor

[Wietse]

I just went through this all myself with the assistance of a guy at Transgo who has been helping me a lot through the email.
Not sure what year 727 you have, things could work out different, specially the fact you suspect some others might already have been in there before you.
My car is a '69 and i assumed my valve body was as well, turned out to be an early '66 VB that was modified already and i had thrown the TF-2 kit in it as well, making things more complicated.
Regardles, the same rules would apply on getting the governor and line/throttle pressure right for a start as i mentioned above.
Your transmission likely has a Part Throttle kick down valve installed as well, depends on the year.

 

[69 GTX]

https://redirect.viglink.com/?format=go&jsonp=vglnk_173310929370811&key=ac712ab515bed570ccd30265c6785a84&libId=m46g4b9r01000bfs000ULanwfwlby&loc=https://www.forbbodiesonly.com/moparforum/threads/727-trans-governor-differences.120487/&v=1&opt=true&out=http://www.hotrod.com/articles/mopp-0208-increasing-shift-speeds-on-the-727-torqueflite/&ref=https://www.google.com/&title=727 trans governor differences. | For B Bodies Only Classic Mopar Forum&txt=http://www.hotrod.com/articles/mopp-0208-increasing-shift-speeds-on-the-727-torqueflite/
I know this is a old thread but thought this link would help.