To understand what's going on with a pro shifted trans you should pull the side cover and look at how much [ i'll call it slop ] there is between the slider and the dogs.Move the slider back and forth from third to forth with your hand, see how easy it slides, now with the slider in forth turn the input shaft back and forth, see how much slop there is? That is why it's a good racing trans and not a street friendly trans. You can not shift a pro shifted 833 under power with out using the clutch . On the street you can play with rpm's to shift but you'll just grind away the slider and dogs faster. Also on the street you'll find that you need to hold the shifter in gear as slop and no syncro rings and tension clips will let it fall out of gear . You can down shift just expect a big clunk from again the slop.