need help wont shift into third

yes i posted twice by accident no mix up just when I posted this last I couldnt find it so I reposted. I already took the kickdown linkage off and drove it around the block and nope no shift. yes reverse is good. first and second are fine. it will rev up act like it wants to shift into third but no go. took it on the free way shifted into third but as soon as I got off the free way it started sticking again. it shifted good when I first drove it around the block.

This indicates to me it's either a governor problem (worn or sticking) or you disassembled the throttle pressure valve in the valve body and installed the sleeve backwards which holds the throttle valve too far. When you rebuilt it did you disassemble the entire valve body to clean everything?