Yes, I'm running a Lock-up on mine. The lockup is supposed to give the most mileage increase over the nonlockup. So when I was hunting the trans I made sure I found a LU.
77 Dodge Adventurer SE 440 2wd SWB 78 Dodge Adventurer SE 440 2wd Utiline 90 Dodge D150 SWB 2wd 318fi 4speed 60 Desoto Adventurer 2dr 67 Dodge Dart Gt Conv. 273 4bbl 04 PT Cruiser GT Turbo 14 Ram R/T "Life's to short to drink cheap beer."