Finally solved the gear mesh issue. The gear set was setting too low, increasing the distance between the crown gear and the tail drive gear. Two reasons for this: There is suppose to be a shim between the two parts of the one way sprage,it was missing. Also the bottom bearing retaining coller was on upside down. It has a raised area on one side. This raised side goes away from the bearing. This pulled the main shaft along with the gear towards the bottom too far.