I am finding the shifting a bit difficult, a grind here occasionlly, a hard push her, nothing consistent, other than reverse usually is the most frequent issue.
Thought I should check the fluid.
Is there a drain and fill plug separate? I haven’t looked yet.
Fluid suggestions, everything I see says be sure it is GL-4, not GL-5.
Fill plug is on the passenger side of the toploader. Fill to the bottom of the bolt hole.
It’s possible that your blocking rings are beginning to wear.