You haven't said why it needs attention and the answers will vary until we know, rear diff seized? or does the car move but with no drive indicating a wrecked diff or broken half shaft?
If the car is capable of rolling will it drive if you select 4WD which effectively now means FWD only...if it does it might be prudent to remove the rear propshaft in case of any sudden diff failure, and make sure theres some oil in the diff to get you somewhere more compliant.
Toyota 4x4s are usually made to be fixed in the field, so like you i doubt there are any electronics in the rear axle area, save maybe an ABS sensor on the brakes...you might find a solenoid shift on the front diff, but i doubt that is computer connected either.
However this is all blind assumption because i doubt the model is even available here.
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