My 1994 Nissan Navara DX 2.7 diesel makes an unpleasant crunch when shifting down from fourth to third while going over 40 km/h. My mechanic mate says it?s probably the synchroes, but can?t say if it?s doing any damage. To be safe, I try not to do it, however, could you say that it would be doing damage to anything?
It’s probably not doing any serious damage, but it’s unusual that the synchroes should be worn as is suggested. Make sure you’re fully disengaging the clutch when you shift and try shifting a little slower and giving the synchroes a little more time to work. You could also try double de-clutching to see if that helps. If it proves to be a case of worn synchroes have the gearbox rebuilt and replaced.
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