Picked up an 81 a few weeks back and I'm trying to get all the kinks out of it. 155,000 miles, L50 Trans I believe. There are lots of threads on this same issue but none really addressed the issue other than shifter bushing and seat. When shifting into first I have to hold pressure on the shifter to get it to go in. If pressure is not held on it, it will just grind and not engage, however if pressure is held on it, it will clunk and go into first. Once in goes in first, it stays in and won't pop back out. All other gears go in and out perfectly. I replaced the shifter bushing and seat with an OEM Toyota one. It did tighten up the shifter significantly but it still grinds.
Not sure if this is a tell tale sign of what is going on but when I initially inspected the shifter bushing and seat, the bushing was fine but the only seat was about 1/8" thick black rubber washer. Who knows how long it was like that. The top corners of the groove in the shifter were worn slightly but not a lot, I wouldn't think that would cause this issue.
Any ideas on what I'm looking at? Thanks for any help you could offer.