12/2003 Ford Courier 4WD. Driving along and it just started to jump out of 5th gear. All other gears OK. Replaced dented spring still jumped out of 5th gear. Pulled gearbox down and can't find anything really wrong. A little bit of wear on 5th gear needle bearing but nothing to serious. Told to look at thrust washer but it also looks Ok. selector shaft looks fine also.

right thats better ,now the 5th gear is on the end of the gearbox behind a metal cover as a sort of extension ,well this gear if you look carefully has syncro rings or baulk rings which are like a line of thin teeth till you take the gear apart then you will see that these baulk rings are like rings with a cone which acts as a break for the gear to slide over ,well where the gear slides over a spring loaded locks and these are worn ,when changing gear on any manual box always give time for the syncros to work as some drivers like to change gear too quick like stirling moss rally driver style and this is what damages the gearbox right thats better ,now the 5th gear is on the end of the gearbox behind a metal cover as a sort of extension ,well this gear if you look carefully has syncro rings or baulk rings which are like a line of thin teeth till you take the gear apart then you will see that these baulk rings are like rings with a cone which acts as a break for the gear to slide over ,well where the gear slides over a spring loaded locks and these are worn ,when changing gear on any manual box always give time for the syncros to work as some drivers like to change gear too quick like stirling moss rally driver style and this is what damages the gearbox

yes them ones as unless the gear change linkage is bent or someone fitted a spring to stop the gear change rattling then their is nothing else i can think of ,except the selector rods in the gearbox itself ,as between these rods in the casing is ball bearing loaded springs that hold the selector fork rods in place when you put the box in a gear ,but i have had the spring on the gearchange before now that shouldnt have been their and this pulled the gearchange mechanism over to stop a rattle and pulled it out of reverse a renault express van as i seem to remember yes them ones as unless the gear change linkage is bent or someone fitted a spring to stop the gear change rattling then their is nothing else i can think of ,except the selector rods in the gearbox itself ,as between these rods in the casing is ball bearing loaded springs that hold the selector fork rods in place when you put the box in a gear ,but i have had the spring on the gearchange before now that shouldnt have been their and this pulled the gearchange mechanism over to stop a rattle and pulled it out of reverse a renault express van as i seem to remember