transmission help

my transmission gets stuck in gears every now and then, it is also hard to shift sometimes. should i get a new tranny? its a 74 z28. i was looking at th400's but i was thinking it could just be the forks or even the transmission fluid. any insight on what could be wrong and what would be a good transmission to replace it with.

what kind of transmission is it?
you say forks like its a manual tranny, but you say ur looking at a th400
are you considering swapping?

posting this in the drivetrain forum would probably help you more than in the suspension forum

srry im new to the site and didnt realize there were specific sections for each component.