The T50 transmission in my AE86 engined Starlet is in pretty good condition.
I've swapped over to REDLINE MT90 transmission fluid and the shifts are smoother than with my old 80/90. But I still have an occasional issue with going into third gear. No grinding or anything. Just that it's sometimes hard to locate third. Not every time. And ONLY third gear.
I sometimes have to try to engage it for several seconds until it goes into 3rd.
Is this a transmission issue or a shifter issue? I've replaced the plastic cup at the end of the shifter shaft. (it was missing) But it did nothing.