I had a problem with 3rd gear selection in my Ducato based motorhome. It crunched every time I changed gear even when double de-clutching. The gearbox has now been removed by the repair garage and sent to a gearbox specialist who says that it will need a rebuild due to water in the gearbox. Has anyone else experienced this or can throw any light on the subject? I thought gearboxes were sealed!

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