Driving along in steady traffic at about 50-60 mph, odd noises from the gearbox. Difficult to describe, a sort of chuff-chuff-chuff. This changed to a medium-pitched whine in 5th and 6th. Eventually there was a more crunching noise and I lost those two gears. Couldn't select 1st or
2nd. Drove home in 3rd and 4th. Can't select Reverse either.New gearbox needed? What sort of cost at a main dealer? Can I trust the local independent, who might not have experience of this work?