Just brought a P38 (95m V8 4.0l auto) and it's syuck in low. How can I get in out of low manualy.?

more than likely, you have a transfer box ecu fault, I've seen this a few times and every time, it's been the ecu at fault.

To get into high manually will be difficult, you could take the motor off the transfer box and turn the shaft by hand but you wont get the motor back on and the transfer box will leak oil without it.

the other way would be to find the wires that go from the ecu to the motor (ecu is under the rear of the front passengers seat) and put a feed and earth down the wires to force the motor back into high, not sure how well this would work though as I've never tried it.

There are only 2 wires that connect to the servo motor itself, maybe I'll try 12v to that in the morning.

Yes the motor came off quite easily (4 bolts) tried it with 12v direct and it worked ok. The spline that it turns is the shape of an 3 sided arrohead.
That part is also dry, so no oil leakage.
Lined it up and refited it and alls now fine.
It's a car I took as a non runner and it did look as this part had recently been removed. Driven the car around today and it seems fine now.