i am not sure how to tighten the pinion nut.
detailed directions in chiltons, haynes or FSM. Make sure you measure the preload on the pinion shaft nut within the backlash of the drive pinion and gear ring. U will need to know this preload when u re-assemble. Other than that its a piece o' cake.
![Yup yup :yupyup:](https://board.marlincrawler.com/Smileys/marlin/yupyup.gif)