Had a custom tune done on my predator for my 2004 Lighting since then I have bought a hi performance valve body and they say I have to return the line pressure to stock when I go into the predator to modifie the shift pressure their is no arrow or numbers to show I am taking it back to stock or making it firmer I dont think they program for a shift pressure When I call the predator people they dont know anything I would appricate any help