[san rensho]

Why rebuild? A bad synchro is no big deal, just learn to drive with it. The tranny will last 100k miles or more with a bad synchro.

If it grinds on a downshift, just learn to double clutch. I can do a money shift on a tranny with a dead synchro if I want to, not that I would. Any one who has had an Italian car can vouch for this.

If it grinds on an upshift, try this. When you go shift from 1 to 2, right before you shift, with your foot off the clutch, pull down gently on the shifter towards 2, not too much pressure, keeping the light pressure on the shiftert, push the clutch in and it should go right in.