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Hello, welcome and thanks for asking your question. My name is*****'m a Certified Auto Technician with 29+ years experience. I will do my best to assist you. please keep in mind that I may need to ask questions of you before I can answer. When you reply please feel free to add as much detailed information as possible pertaining to your concern.
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Can you post the last 8 digits of the VIN so that I can do some research on this concern for you?
I got the VIN. Thanks. Sorry been offline this afternoon.
Basically, everything that you described with the exception of the noise is considered normal. As for the noise, can you tell if it is coming from the front or the rear? The fact that it comes and goes with acceleration and deceleration leads me to believe that one of the ring and pinions is making noise but you will need to determine if it is front or rear. You may need a chassis ear to determine if front or rear.
If you have any questions about why it does what you were describing, post a specific question and I'll be happy to answer...
Here is an explanation of how the system compensates for traction loss. (Basically Electronic Traction Control)
Quadra Trac 1 Explained
Keep me posted and let me know if you have any additional questions...
From everything you have described, I'm leaning towards a problem with the rear diff, most likely ring and pinion. Transfer case normally doesn't change in sound whether you accelerating or decelerating, ring and pinion can do that. Since you say noise seems to be from the rear I would start leaning towards the rear end. I recommend to remove the cover for inspection. You may find obvious failure in there and be able to fix it..