I've been through a few, get yourself an ATSG manual one of the better ones. Haynes manual has photos which can be helpful, but not as much tech. They are not difficult to do, but time consuming. There have been some subtle changes throughout the year spread so pumps can be case specific and the shafts and planetaries and such need to be kept together as there were some differences in the splined areas. The paperwork for the shift kit would be important if any case mods were made. clean is important, a piece of lint can jam a valve.