Hi guys I am having problems with gearbox when driving at speed at high revs,last Saturday when changing from 3rd to 4th it would not go into gear I had to stop and then put it in 1st,the same thing has happened twice since,I have had a problem going from 3rd to 4th at speed for a while but the car is fine when driving normally,it's starting to do my head in now lol any help much appreciated cheers steve