The gearbox may well need overhauling at that mileage, but a bit of a whine is unlikely to signal imminent failure - as long as it has oil in it. Lazy synchro may reflect a dragging clutch, almost certainly a hydraulic problem and much cheaper to fix than anything involving pulling the gearbox.
The leaky power steering is likely to be the seal on the Pitman shaft. While this seal can be replaced cheaply, if the shaft is worn where it is sealing, it will be expensive.
Probably your biggest concern though should be a point not mentioned - chassis rust. Especially if you are not capable of doing this yourself, it is expensive to fix. Also, check suspension bushes and the ball joint on top of the rear axle - these, while not individually very expensive, add up, especially if paying someone to do the work. Similarly, check the tie rod ends.
If it has been reasonably well looked after, it should still have a few hundred thousand before major work, but, as you apparently understand, it is a long way from new, and could be getting into the age when unusual problems may emerge.
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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