ok im pretty damn sure this has to do with my tranny but i think there is a possibility it could be the motor. ok so when going up hill around 1500 rpm to 2000 rpm at 30mph or 50km/h in 3rd gear i can see the tach bouncing about 100rpm like it want to downshift but wont do it. more than enough power to make it up the hill with the engine speed it has been doing it no problem for 3 years now and last week this started. you can hear the engine changing pitch also. no vibrations while this is happening either. so let me know if you have had this problem or have an idea on what i could be.