I recently purchased a 2001 Club Car DS 48V Powerdrive Plus(It has a forward/reverse switch). When the accelerator is pushed down, the cart is pretty quiet. When the accelerator is released or when the cart reaches its max speed (approx. 15 mph), there is an unusual noise coming from the rear end. Please see the video link below for details. I checked the rear brakes and they are not rubbing, the wheels spin freely when jacked up. I also checked the oil in the gearbox and there is oil but not sure if it is good oil or not. Any help on what could be happening is appreciated. Thanks in advance.
2001 Club Car DS Rear End Noise Video
2001 Club Car DS Rear End Noise Video