Gear change crunch

Hi there, my clio 197 started doijg a crunch sound when I change from 2nd to 3rd what could cause this and how can you fix this
 
Hi there, my clio 197 started doijg a crunch sound when I change from 2nd to 3rd what could cause this and how can you fix this

does it do it in high revs…

Its down the to synchros in the gearbox wearing / failing.. it’s a sign your gearbox needs either refurbishing or replaced
 
It be the clutch not fully engaging if you notice it in all gears but if it’s 3rd and 4th it will be a gearbox out to see the damage I believe.
 
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