The other day my '03 Ford Fiesta suddenly failed in 4th gear when I changed from 3rd to 4th. My revs shot right up reaching roughly 5000 without any acceleration then after a few seconds the revs went back down to normal and speed eventually went faster but it's happening all the time. 1st and 2nd work fine, but 3rd and above fail in speed and revs shoot right up all over. 3rd gear was not actually that bad at some points. This started as I just came off a slip road onto a motorway so it was a bit scary as my car struggled to reach speed but eventually it got to 70mph.
I left my vehicle at a garage as soon as I got to my home town.
Does anybody know the cause? I'm waiting for my local garage get back to me as well.