Took the car out for a little cruise. Shifts from 1st to 2nd nice. Then going from 2nd to 3rd it seems to hesitate some. This is while normal driving you can hear the RPM's get up there and if i bring my foot off the accelerator it will shift. I do not hear the car going into 4th. Is 4th considered the overdrive gear? While driving about 50 and switching my shifter from overdrive to drive i do not feel a difference. Rpm's remain the same.