3rd gear crunch

[Jameshannaa]

Hello new here. I have an 06 berlingo that crunches going into 3rd every time unless you let the revs come down to idil speed. Any idea what might be causing it? Thank you

[SinsBird]

Usually caused by worn synchro rings in the gearbox, but sometimes there can be a problem with a shift linkage.

[jj9]

When you shift from 2nd to 3rd try giving the revs a blip just before you engage 3rd, it may help.

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[SinsBird]

...

If the problem is in the synchros you can do rev matching and double clutching when shifting. When shifting from second to third, clutch neutral, clutch third. When shifting from fourth to third, clutch neutral, blip the throttle so the rpm goes up, clutch third. You will learn how much to rev when downshifting and how much to wait for the rpm to come down when upshifting as you go.

[Zion]

Or you can get another gearbox fitted instead of learning how to live with it.

On a serious note, try a full gearbox oil change and see if it improves. New thick oil slows the gears down more between gear changes for a smoother shift.