Other than Mazda! I'm currently having issues with the syncros on second gear and third gear. At higher RPM's and sometimes just for fun these gears are really hard to get to engage and in the case with second gear, sometimes it grinds pretty bad both up-shifting and down-shifting. So, that being said, I am contemplating tearing out the transmission and replacing the effected parts but other than Mazda I am at a loss for where to get replacement parts like that. Anyone have any thoughts or ideas concerning this???? Thanks in advance!