THE REAR SET SCREW on the shift rod. Don't be lazy like me and fight with the shifter for a month. This set screw has loosened up on me twice, even after using loctite. Also make sure you clean out the gunk from the cavity in the shift bar. I might have forgotten to do this previously. Before retightening I couldnt get into 1st or Reverse, gates were really sloppy and felt like positions were changing, kept missing gear. Now it's soooo much better, i'm actually happy with the way it shifts once again. (BTW - i have a sideshift, not sure what the config is on a tail shift)
So lesson is.. don't be lazy. Check your rear shift bar set screw. I've had both loosen up on me. Also while you're down there, check the shift bushings, there are so many things that can cause sloppy shifting. My bushing where the shifter enters the rear box is shot as well.
Anyway, just wanted to pop in and say hello. I havent posted on here in a few months. Got a new job and just haven't had the time. I have been autocrossing here and there. Car is running really well, it's a blast to drive!
Cheers