Gearbox issue

[gdaddy1980]

Hi guys, my friend has an issue with his gearbox in the flavour of, he can go up all gears fine when driving but when coming down the box it gets stuck in 4th until stationary when it will then pop out and same senario happens again once moving. This only happens in 4th gear when moving down the box, all other gears are fine....Any ideas??

[Aidan]

if it isn't a linkage issue then it could be the synchrohub is cracked, no way of proving that without stripping it, but given that the synchro wants to go to the neutral position the fact that it doesn't with any sort of load, ie either input or output side are loaded would point to that
often no debris or tell tale on the drainplug to confirm that fault
ensure your friend has recovery as it may stick in 4th or even 5th completely wcs
I'm guessing it's a 5 speed but diagnosis is pretty much the same for a 4 speed

[gdaddy1980]

hi aiden. its actually a 4speed but as you said i guessed the prognosis may be the same for a 5 or 4 speed. we have not played around with linkages at the moment, but he did say he felt a clunk a few days before the problem occured, so pointing towards something breaking and cracking im guessing.