Unimog Club UK

Hi mall and welcome to the club 1983 you will have three piece axles and the difflock actuators are in side the axle case, best thing to do is isolate the axles there’s a flexible pipe where the torque tube connects to the transfer box clamp these front and rear to assertain which one is leaking, front is harder to do than the rear you can either remove the complete axle or split the axle in situ I prefere to remove.
Good luck