Ok so I have a 99 sierra 2500 4x4 6.0. Parked it last night no problems. Get in this morning back out and put in drive . As I pushed the gas and started straightening the steering wheel the front driver side made a loud pop sound. After that accelerating I had a vibration for a while. Stop and take off no pop but vibration. I drove for about 45 mins vibration went away. I put in 4wd low no issues 4wd hi no issues. Any clues?