when driving along at motorway speeds the gear selector pops itself out of 5th gear!
does this mean the gearbox is nackered or does the selector mechanism need adjusting? it only pops out of gear from 5th, no other gears.
5th gear is unique in the fact it runs on the outbaord end of the main shaft and has its own hub and clutch system to engage. all of this is housed under the bulbous end of the gearbox that you can see through the passenger wheel arch.
You can take this end plate off quite easily with minimal gearbox oil loss. worth doing just to check its engaging properely.