I've got several synchro/blocking rings to choose from for a tranny freshening here...........

the "New" synchro's have a better inner surface that rides on the gear cones but they appear to not have the nice "points" that I've been told to look for.

Some used synchro's I have actually have nicer, well defined "wedges" or points that would otherwise be called "dogteeth" but not as prominent of ridges that would slow down the gear cones.

I'm tempted to go with the used synchro's since all of them don't bottom out when fitted to the gears. New, old, all are about the same. I can get some actual measurements later.

Which is the priority, machined cleanly flanked teeth or the ridges on the tapered inside???

what year tranny ????
IIRC you can use the late style brass in a early box but you cant use early brass in a late box
..

Dude ... just buy new one's !!!!!!!!!

Both are important, but sharp dog teeth are perfered. You can always scuff up the cone with 220 grit wet or dry or 150 emery cloth. to make the brass ring grab.
The brass ring should be as close to the end of the cone as possible. If you have a bunch to choose from, look for the best fitting.

68LAR,

Thanks, that's the wisdom of experience I was looking for. And, in that case, my used synchro's are NICER than my NEW (meaning recently purchased with cash/money) ones. Go figure.