down shifting

This is my first mopar 4 speed so I am not sure if what is going on is normal. When driving say 45 mph in 4th gear should I be able to just down shift to third after letting off the gas an slowing down a little. Seems like it won't down shift till the car slows down enough to go into a lower gear. Is this normal? I was watching a youtube video of a small block mopar doing the 1/4 and at the end of the race he was dropping gears and slowing the car down, I could hear it revving while he was down shifting. I can get it to down shift but only after slowing down and revving the gas pedal a little and it will down shift. I had a rock crusher when I was a kid and I don't remember having to do this when down shifting. The car shifts fine other then this question.