Always add fluid to the torque converter to keep the transmission from running dry at startup. It goes without saying that you should replace all the old fluid with new. Jeeps R Us isn’t a dedicated transmission shop, so they didn’t have a fluid reclamation/recirculation machine. Instead, Garcia blew out the transmission cooler lines with compressed air. The entire system was refilled with a total of 8 quarts of Royal Purple Max ATF, including the quart that was put into the torque converter. After that is filled, carefully slide it onto the input shaft without forcing the converter and keep in mind the input seal. Then reassembly is the opposite of removal.