Forth gear is not a gear as such but a straight coupling of the input and out put shafts
check the gear shift lever for obstructions at the turret or under the mat
Check the drain plug magnet for metal
,3rd and 4th forth use the same selector rail and if there is a problem with the 4th selector fork there would be no chance of selection any other gear as it would lock the box
it is possible that the syncro ring assembly has failed preventing the movement of the dog to engage the teeth in which case it is box out for repair
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