I'd be looking at engine tune, but don't expect much better unless you keep the speed well down. Also look at tyre pressure.
The 2a box will whine for a long time before it fails, although repairing it sooner rather than later may be cheaper in the long run. The Series 1/2/2a boxes are a direct replacement (assuming it has the original box) although there was progressive improvement, so the later the better. Series 3 box is a pretty easy replacement, although the clutch release is different and there is some messing about changing it. Note that the six and four cylinder engines had different bell housings and if getting a replacement box you need to make sure it is the same, although subject to some restrictions the bell housing can be swapped with a bit of work.
However, it is probably going to be cheaper to repair your own box - fairly easy even if you have never done one if you have the manual - than to get an exchange reconditioned one, and if you get a second hand one, it is almost certain to have done a lot of work. It is likely that all you will have to do is to replace bearings and seals, unless it has been abused. (did you get any metal or water out when you changed the oil?)
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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