I have a 2001 Chevy Suburban one day I was driving it and noticed when I turn it was making a popping sound so I pulled over cut off to check my front end work so when I started the truck back up I noticed that it was in 4-wheel drive so I put it back in 2 wheel drive and the car wouldn't drive but when I put it in 4-wheel drive the truck drove just fine anybody know what's going on with it please help

 

rear drive is shot. driveshaft or ring/pinion.

 

I had the same issue, more than likely the actuator in the transfer case is shot. At least that what was wrong with mine.

 

You can pull the shift motor and with a crescent wrench shift into neutral, 2wd. Make sure you chock the wheels!

 

So i put my truck on jack ramps and put it in 2wd and 4wd so the front tire turn but the rear didn't. The rear drive shaft turn but the tires didn't what do that mean

 

okay so I lifted the car up off the ground put it on jack stands and I put the car in gear and two wheel drive the back tires did not spend at all so I put it in neutral shift into 4 wheel drive and the front wheel spent but the back did not spend the driveshaft was the only thing that would spend on the rear end any idea

 

Sounds like the ring and pinion gears are shot.