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What should I do if my 2011 Mitsubishi Triton makes a grinding noise when changing gears?

Asked by Joseph

When changing from second to third gear in my 2011 Mitsubishi Triton I hear a grinding noise. But when changing down from fourth to third its fine. The car has done 84,000kms. What is most likely the cause here? 

Answered by CarsGuide

23 Oct 2021 David Morley

Mitsubishi’s manual gearboxes from around this time (and earlier) were some of the noisiest around. But usually it wasn’t anything to be concerned about. Bearing rumble and some clutch bearing noise were pretty much par for the course, but your problem sounds more like it’s associated with the gearbox’s synchromesh rings. These rings are designed to allow the gearbox to slip between ratios smoothly and silently, and any crunching noises during shifts can often be traced to worn synchromesh parts.

The good news is you won’t harm the transmission by continuing to drive it, particularly if you’re careful and take your time with the shifts you know are most likely to create a crunch. If you can live with that, fine. If not, the gearbox will need to be removed from the car and rebuilt. That will be neither cheap nor simple.

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