Thanks to you all who have previously posted gear box issues and solutions on this site. recently i have had issues selecting 4th after spirited driving
, ie the engine reving hard for extended periods. This was happening more frequently as time went on. The gear box oil was new and i had removed the end plate to check for swarf. It was then i read about checking the pin that allows the cable location bracket to swivel, when i did it was as dry as a bone and starting to pick up. after a complete strip and clean, followed by a greasing the problem so far has not been present.
As the strip is a bit fidely, and involves removing the two control cables which are located using plastic
sockets (as in ball and socket joints) i will be fitting a grease nipple to ease further applications of grease.