I have a question for the experts out there...I have recently had problems with my auto tranny on my sentra 2.5 l. It will shift hard going from 1st to second , not as hard from 2nd to 3rd, 3rd to fourth. I checked the fluid requirements from the service manual and it says that for the tranny a refill is 9 qts.US , but I only drained 4.25 qts! The stick shows it is at a normal level. Am I missing something on the refill instructs?.The shifting appears to work normally after it warms up for 15 minutes. Thanks to all.