I had something like this happen after I installed my 8.8, I did something very stupid to find out wear the noise was coming from. I layed under the jeep and had my wife hold the break and hit the gas so i could see where the noise was coming from. Very stupid not recomended but I did find my noise.
Turned out when I was installing the axle I had issues with where the Muffler shop put my tail pipe so I cut it the tail pipe off. But What I didn't realize is I left the exaust blowing directly on my top shock mount which eventually melted the bushings out of my brand new shock. So now i have to figure out if I can get a new bushing or do I have to replace the shock.
