I have a 2011 Mazda CX-9. The car is AWD. Should all 4 wheels spin freely when on a lift and the car is in park and the parking brake is off? All 4 of the tires do spin freely. I believe I have a bad transfer case and was trying to diagnose if the transmission or transmission splines are shot before yanking the transfer case. Thank you for your help!
What exactly are your symptoms that you think it’s a bad transfer case? Wheels spinning isn’t likely to be able to tell you anything about the transfer case.