Service light is on for all wheel drive / right axle. Cost service to repair all wheel drive on 2016 buick regal

Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. I'm sorry to hear you're having trouble with your Regal. The service light and clicking noise suggest an issue with an axle or a component related to the all-wheel-drive system. Since this started after the transmission replacement, it's possible something wasn't reinstalled correctly, such as the axle, differential, or AWD transfer case. The clicking noise might indicate a problem with the CV joint on the axle, which could have been stressed or damaged during the repair. Repair costs can vary, depending on labor and parts cost. Contacting a local repair shop for a diagnosis and estimate would be best. If you need more advice, have any other questions about your vehicle, or would like to get connected to a RepairPal Certified shop near you, we have you covered. Give us a call at 877-913-1554, and we will happily help you out!