[MAX IV Mark]

I am not sure about the exact details firsthand. I have never done one myself.
Good info here on how to do it and breakdown of the transmission.
http://www.6x6world.com/forums/conte...build-how.html
It could just needing band adjustments, I would follow the procedures for them exactly as stated. If someone just starts turning adjusting nuts without knowing the procedure they will burn things up inside, it will be like riding with the brakes on all the time.
Mark