After having my hole gearbox out and having reduction gears a new stronger 5th and clutch put in I will now (today) be extending them up under my bonnet.. The gearbox guys found there to have been excessive water in both gearbox and transfer witch resulted in warn synchros...

So if I was you I would do it asap.. I have done my diffs and they are in great order with no water ingested at all..

Lewy