All auto transmissions require servicing at some point. The standard interval will be listed in the service manual for your car. The frequency of servicing your automatic in Darwin will depend on a few factors, some conditions will increase the need to have an early transmission service, these are: frequent towing, driving at high speeds for extended periods of time, driving in extreme conditions or using your vehicle at race tracks.
You should browse our listings to see local transmission repair shops in Darwin. There may also be specialized repairers for your particular make of car, it is worth checking if this service exists near you.