Thanks for the reply, I did change the oil last year as per the how to (below in italics), some did say about overfilling it to avoid bearing problems but others not so went with factory fill capacity.Notchy gear selection is a sign of lack of oil or the oil is in need of a change.
There is an adjustment for the linkage but if all gears feel the same and are selecting OK it's unlikely to be needing done
Cheers, might be worth me topping up as I am at 2.4 in theory (mine doesn't have the level plug) I at least have idea of how much is in there.I'd try resetting the linking then just in case. If changing the oil I'll fill it to the fill plug (earlier boxes) then add half a litre. That gets you to roughly 3ltrs. When doing a rebuild I put 3ltrs in as the box will be completely empty