Thinking about this transmission, it would not shift manually at wide open throttle, I never did try shifting it manually not at wide open throttle. It would shift in Drive provided I let off the gas, that would raise the vacuum signal and make it shift. Is it possible that maybe I just need two make some changes to the governor for a lower RPM? This transmission may have been out of something with a V8 in which case you probably would not want it to shift lower than 5000 RPM at wide open throttle. If the valve body is not a full manual valve body will it still shift up when you are manually shifting at wide open throttle? I hear what you are saying, and I know you have a ton of experience with this, are you considering the power level here? I'm thinking with the carbs ironed out and a good tune we may have 225-250 hp.