I personally like the Transgo tugger hd II kit, because it not only reworks the valve bodies, but ALSO the front pump. Why rework the valve bodies and not do anything on the front pump side to increase your pressures? I absolutely love the way the tranny performs in stock mode with the Tugger kit. Then if you do power mods, your tranny has the line pressures to handle them. Very highly regarded by lots of 7.3 owners that work their trucks day in and day out. Lots of people avoid this kit simply because the tranny has to come out to do the front pump. Simple vavle body kits require no removal. Good Luck!