1998 Dodge Ram 4x4 p/u trans prob.

[ff_442003]

98 ram p/u 4x4 360 motor
when driving in over drive u can watch the rpms and they move up and down u can here it to while holding gas steady, seems like it is coming out of over drive but not down shifting, kinda like inbetween gear. trans is not slipping. when u press the gas slightly it goes back in but when holding steady shifts in and out. every thing shifting wise is fine, also when taking off from a stop u can get on it and it seems not to have alot of power most of the time some time it has lots of power. if i shift it my shelf the power is there on take off some tell me tourch converter, some tell me servo is leaking i would like a profftional out look