Couple of tear down tips...remove the cluster gear shaft before trying to remove upper gears...this will drop the cluster down so that you can get the input out and remove the 4th and third sycro hub...then you can pull the rest out the top and disassemble. When reinstalling you will need to pack the cluster gear rollers with packing grease and leave laying on the bottom with thrust washers in place...and just set front and rear bearings on input and output in place partially in case...then with pto cover off you can pick up cluster and slide shaft in without disturbing rollers. Good luck. Ed