i noticed what makes the grind. say i had a good hub slider and brass ring gear...and i reshaped the syncro mesh teeth that were rounded and worn, back to a point and not taking much off. wouldn't reshaping the syncro teeth on the gear make it shift smooth again? it seems to me it would work just don't know if anyone has bothered rather than replacing the gear?

 

This works okay if the only real problem was rounded synchro teeth. But if the inside ribs of the synchro are not sharp then you'll have grinding (because the synchro can't slow down the gear well when the ribs are flat).

 

maybe even if the hubs ribs were not pointed either, you could just repoint/sharpen them too.

i compare the way the sycro assembly works kinda like two swords. if someone was swinging one down at you, then you have to angle yours in a way to catch the sword and slide it to the side. if you would block the sword coming at you, perpendicular to it or parallel to the ground, then you have a bad clash which would be the grind.

 

Remember that the inside cone shaped part acts as a clutch or brake on the gear so it needs to be able to grip the gear well enough to slow down/speed up the gear to match speed. People who know way more than me can reshape the "teeth" to work better than stock under racing conditions. I assume it sacrifices life span somewhat. I don't know what to do about the inside part of the synchro though. Some american transmissions use a friction material inside the synchro for the grip so can be modified with different materials.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mohudsolo &raquo;</TD></TR><TR><TD CLASS="quote">Remember that the inside cone shaped part acts as a clutch or brake on the gear so it needs to be able to grip the gear well enough to slow down/speed up the gear to match speed. People who know way more than me can reshape the "teeth" to work better than stock under racing conditions. I assume it sacrifices life span somewhat. I don't know what to do about the inside part of the synchro though. Some american transmissions use a friction material inside the synchro for the grip so can be modified with different materials.</TD></TR></TABLE>

cool...very interesting...yeah i've just been messing with a lot of tranny stuff and trying to figure it all out. i used to build/race on road and off road cars. this stuff just interests me and it really relates to what i used to build.