2003 Gmc Envoy 4wd Front Wheels Won T Turn 4wd Transfer Case Motor Clicking

The 4wd the front wheels won't turn in 4wd. The transfer case motor is clicking but when i jack the car up in the air an engage the 4wd i hear grinding noise and vibration from both cv axles and i change the 4wd actuator thinking it was engaging the cv joint properly but that did not help with the grinding noise or make the front wheels turn.