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Message: <blockquote data-quote="morpheus5039" data-source="post: 521614" data-attributes="member: 6539">worn synchronizer at 2nd gear. try to engage the gear slower, better if 1st > N > 2nd. u can try to change gear oil. I tried redline MTL before, it solve the grind when transmission is hot but not when cold.If no effect, better check the whole synchronizer (including synchro. ring, sliding sleeve, synchro. body & clutch body), check for worn out teeth, or any sign of brushing.If you keep shifting rough with the grinding, your synchro. ring may break one day and you will get free gear even you engage the gear, and if broken pieces fall between the helical gear, then you will hear loud noise from the gearbox.Your myvi grind in reverse gear because the transmission main shaft still turning in a particular direction due to inertia and suddenly u make them contact with the reverse gear sleeve which turn in reverse direction, sure they will grind to each other.Sometimes in some car with no synchronizer for reverse gear, even when the car has just fully stop (from forward) and you engage reverse gear you will still hear the grind as there is no synchronizer for the reverse gear. Input shaft still turning fast and suddenly the power get connected with the mainshaft which is static.</blockquote>