No go on the axle shafts fixing the noise though it did seem to help a little for the first few days. Really does it when I'm backing into a parking spot with the wheel turned. Back to the dealership again next week (3rd time for this). I have a laundry list of issues on this truck now to go along with the rear end noise:
1. Exhaust valve squeaking like crazy whenever I hit the gas. Dealer said you either get one that squeaks or one that shakes. Good to know.
2. There is a really bad squeak in the front end whenever I hit any small bump in the road. Sounds like a plastic on plastic squeak.
3. Noticed last week there is a rattle in the dash just above the head light knob. If I tap on the dash there is a rattle/vibration.
4. I also get a nice creaking sound whenever someone gets out of the truck. If I grab the bed and rock the truck back and forth I can replicate the sound.
5. On the drivers side there are tons of little paint imperfections.
6. Onstar randomly activates and then ends the call without actually calling out.
7. Rear camera goes out about once per month. Have to shut it down, let it sit for a minute and then restart before it will work. I can't get it to repeat so the dealership won't do anything.
8. A/C randomly goes into recirculate. Dealer said this is normal.
My 1 1/2 year old truck sounds more like a 10 year old truck with all the noises it makes. I like the truck but all these little problems are getting ridiculous.