Hey guys, I've had my '99 blazer for about 2 years and the 4x4 always worked great. Recently when i kick it in 4 low and give it a good bit of throttle the rear wheels start spinning then the vehicle lunges and all 4 start pulling? Its never done this and im not sure why it is now. Also around the same time a loud jerking and cracking started coming from the front end no matter if im in 2wd or 4. It was making a simular noise and my dad replaced the bolt and bushings on one side of the sway bar and it stoped untill now. Any thoughts??

 

Sounds like you front differential actuator is having issues. Corroded cable or vacuum leak perhaps?