The gear ratio of the planetary set is preselected to reduce the input speed to the torque converter while increasing the input torque to the torque converter so that {HEAD ~ the output} of the one remaining engine is more efficiently matched to {TAIL ~ the torque converter} 
The gear ratio of the planetary set is preselected to reduce the input speed to the torque converter while increasing the input torque to the torque converter so that { HEAD ~ the output } of the one remaining engine is more efficiently matched to { TAIL ~ the torque converter }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL