On the 790 you will have a tricky time shifting while rolling. You may get the hang of double clutching and be able to do it without grinding, but either way it is tricky. On my MF with a 12/3 tranny, i can shift from 1-2 (and back) in all three ranges while rolling; also R-2 (and back) without any grind. But for some reason - the way the tranny is designed, I have to double clutch to shift from 2-3 or 3-4.