i have been feeling something funny in my car on the highway. when i get on the gas to get up to speed with traffic the motor well rev to get up to speed like it should. when it reaches the point to where it should shift it will but it feels like it slips into gear and the rpms will drop all the was from i think 5G to about 5G. i can feel it slip it just started doing it about i would say 3 weeks ago. the car does have 67K on it and its the 01 4 speed tranny. is it time to get the tranny cleaned and a new filter ?

crap sorry about the typo
"the rpms will drop all the was from i think 5G to about 5G"

it goes from 5G to about 2G and it stays there when im going 70-75