Will need advise on gearbox transmission. When my engine is cold, shifting of gear is simply smooth and easy. However, after my car get hots, I require a lot of force to shift the gear. I have changed all the bushing and my linkage is too tight. Can I check what is the issue?

it only happens after my engine get hots

 

take the shifter boot off, spray the heck out of the bushing with PB Blaster or similar penetrating oil. I know on mine that was the cure.