I'm messing with an 828 Powershift. Lots of small issues with it from previous owner neglect. I want to get it running to find out if the transmission and controls are functional. From the manual the transmission control and axle shifting seem rather complex and parts count high. I've not heard much about the axle shifting feature and how much practical value it has. Any opinions on that? I really would like to find one with a differential kit. How common are those? Thanks!