I have found out why the 4th gear syncro is shot.......With the reatiner in place and zero lash there is not enough room for the blocker ring to move it actually presses on the cone when tightened. The only solution I can see is using a shim behind the race to make the needed room. If anybody has or knows where I can get a t5-Z manual or blow up to help in fixing this thing I would love it. I'm gona put a call into the trans shot to see if they can help.