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My Toyota corolla Started making grinding noises when I put it in reverse I checked and replaced the oil everything seemed fine (No metal particle contamination in oil).
So I ignored it but it got worse and worse and when I did the clutch I inspected the gearbox and this is what I found.
Most gearbox's have synchro cones to change gears but the reverse gear in this vehicle does not.
![](https://i.ytimg.com/vi/6yhNv_f7RrY/maxresdefault.jpg)