I have only installed seal included output shaft supports for customers using roller low reverse drums, hence, I can't comment on other types of designs. A racer friend called me, telling me that he had to apply more than usual throttle, to get the car to creep forward. I wasn't involved with the build, so we went through the flow chart. Knowing he is anal, I started wondering what we missing. The answer was unsealed torringtons. Once corrected, the trans was fine. Since I wasn't there, I have no idea what test pressures were, or weren't showing at the servos.