For sure, I wouldn't put it together until it shifted on the counter up and down through all the gears with NO trouble. Unless you like tearing it apart! Lol. No, for real, it should shift up and down through all gears with just the tranny in the lower case half. Then install the top (I do this with no sealant) and tighten the bolts down and run through the gears several more times. If I like everything, I open it back up and seal everything and continue assembly. Just my thoughts.
SP