Cab comparison: Semi-powershift versus CVT Unlike the two tractors in the September magazine, we assess three gearbox variants in this MF cabin run-through, which considers accommodation on the 6475 Dynashift, 6480 Dyna-6 and 7475 Dyna-VT models. Bear in mind that the Dynashift is no longer available, so comments on this tractor are only likely to be of interest to existing operators and second-hand buyers