| during tow tow hwul mode the tq converter locks up more often it will lock in the last part of 2nd in 3,4,and 5 it does this to retain cooler trans temps it also delays shifts to get the max power out of your truck, running in tow haul is decided by you if the trans temps are up or it whats to shift from 4 to 5 often then run tow haul |