So if I leave it unplugged what will happen?? will it lockup but then not unlock??

My friend (known him for 20 years) that owns the transmission shop told me that "If I left it unhooked then I will have no lockup at all and that it would shift like a regular 3spd" He's never steered me wrong before and has built trans for me in the past , plus the 40 years experience building transmissions that he has.