Someone school me on converter/pump relationship please!

Hell I think mine stalls at almost 5000 now behind the 493 and the trans rarely gets over 180 most of the time cruising its barely moving the needle on the temp gauge.
only time I ever really notice the crazy stall is if I start it up and need to back the car up before it warms up a little. then the engine might r up a little before the car moves.
I think rusty & rocco hit it on the head. buy a Good converter spend a little more now and you will be happier.