Believe it or not, despite all the crap I get from you guys, I do respect your expertise, hence why I'm posting this question here instead of in Eastern Imports. So, the second and third gear synchronizers in my RX-8 have been giving me some grief, especially when it's cold out, but also a little bit when it's warmer; there's sort of a clinking sensation just before they engage, like the synchronizer splines are trying to engage before the cones have finished doing their job getting all the parts moving at the same speed as each other. I'm concerned that this is going to cause damage to the spline teeth before the cones get broken-in enough to do their job properly. Now, if my understanding of how synchronizers work is correct, there's more going on than just the cones rubbing together and then the splines sliding into place. The way I understand it is, when the cones first contact each other, because they're moving at substantially different speeds, this causes the inner part of the synchronizer to twist inside the outer part a little bit, and this engages a locking mechanism that keeps the splines from being able to slide into place until all the parts are moving the same speed. I think what's happening inside my gearbox is the cones on the second and third gear synchronizers aren't meshing very well, because they aren't broken in, so there isn't enough torque being applied as the parts try to match speeds. This is allowing the locking mechanism to disengage prematurely so the splines can try to slide into place before everything is actually moving the same speed. Again, this is based on my assumption that there actually is a locking mechanism inside each synchronizer, though the way it behaves certainly makes it seem like there is one. So, I had this idea the other day, while sitting at a stoplight on a side street that takes several minutes to turn green. I thought, "why don't I shift into Neutral, close the clutch, and then try to shift into second and third gears so the synchro cones can rub together and break-in faster?" So I tried it, and as I expected, the spline teeth never tried to engage because of the torque being applied to the cones. So I did it some more, trying to shift into second and third gears for about 3 seconds apiece, pushing just hard enough to see the tachometer drop a tiny bit, then dropping back into Neutral. I've done this about five times now, sitting at the same stoplight, just rubbing the synchro cones together for a couple of seconds and then dropping back into Neutral. I've noticed a distinct improvement in gear engagement in second and third gears since I started doing this, and I've also noticed it's getting easier to make the engine bog down a little -- I don't have to push as hard on the shifter to make it happen. So it does seem like the synchro cones are breaking-in and fitting together better as a result of my experiment. What I want to know is, is there something I'm not considering that makes this a phenomenally stupid idea? Is it something anyone here has ever done? Let's go ahead and assume that I'm not an idiot (though perhaps misinformed), and I'm not going to keep doing it forever, and once the gears start shifting the way I like I'll stop breaking in the synchro cones this way. Is this a reasonable thing to do to accelerate the break-in process on these two gears that have been causing trouble, or should I stop right now and never do it again?