I have a 1991 4Runner V6 5spd that gets really hard to shift when the transmission warms up and every time I go to put it into reverse it grinds, I'm worried this is a major problem and I'm not sure what to do.
I've put a new clutch in about 5000 km ago and a new slave cylinder about 1000 km ago.

Please help and thank you in advance for any help I get.