Tranny whine

Started to have problems engaging 5th gear and tranny also whined when in fifth. Took out the fifth gear metal cover to have a look. The shaft nut at the end of  secondary axle was loose. That nut holds the 5th gear synchro assembly in place. Loosening of that nut is a 'type problem' of the MA-gearboxes and Peugeot has since made a better locking nut to remedy that. I would have bought the evolution nut but the local Peugeot dealer had priced it so ridigously that I ended just tightening the old one. The 5th gear engagement was now ok, but whine did not go away. Probably changing of the whole 5th gear assembly is the only solution to the whine problem. I have plans to do it some day, as I'd like to try a little longer 5th gear ratio. The cover was cleaned from rust and painted - of course ;-)