[THE NEW GUY]

manual option works only on 3rd and 2nd gear. it forces tranny to start in 2nd speed without passing trought 1st speed to avoid slipping in certain circumstances.
Shifting the lever on 3rd gear with the Manual light on, the first lowering rpm you see on the tach is cause of the tc lock in 2nd speed. then, the second lowering rpm is when tranny changes to 3rd speed. If rpm goes too high in 3rd speed, tcu will engage 4th speed to protect the engine. same in 2nd and 1st gear.