I really think this is minor but here goes

Alright got a buddy with a yz 450f 2004. He says the shifter will stick shifting down or up sometimes he already replaced everything except this assembly attached below the shifter. When you shift to final gear it wont go into gear completely and go in and out. Shift forks have been replaced. Any ideas?


Yup.  The lugs on the sides of the 3rd and 4th pinions (the gears on the main shaft) are rounded off and will not hold the drive load when engaged.  The fact that it skips in and out means it has probably already bent the main shaft shift fork.

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