1975 25 HP Johnson Problem shifting after re installing lower unit

[EMW73]

I dropped my lower unit and replaced the impeller and then reinstalled the lower unit and now Im having trouble with grinding when trying shifting into forward. Also sometimes I cant get it to shift into reverse at all. What should I check out first? Any help please.

 

[boobie]

Take that little cover off the side of the motor again and make sure you have the shift linkage put together correctly.