could it be my transfer case?
ok I was driving my truck no noise.... I turned left on my road when it sounded like something broke. I immediately took my foot off the gas (I thought it was my drive shaft) my truck is running fine in park and switches gears fine the only time it makes a grinding glass breaking noise is when the truck is in motion I jacked the back end up and put it in neutral and tried to spin the tires by hand but it was like they were stuck and making that grinding noise when I tried to spin them I pin pointed the noise to the front end where my drive shaft goes into my transfer case and I felt the transfer case while my friend tried turning the back wheels and the sound is coming from there I am pretty sure. but I don't know if its my drive shaft or what in my transfer case needs fixed. also when my truck is in motion it feels like is gets hung up on something until I push the gas then it makes that grinding noise and breaks loose....... does anyone know what my problem could be? I have a 2004 gmc sierra 5.3L 4wd z71