So i took my nice shiney summit out this evening to bash around with my son and his little RC rubicon he got for his birhtday and noticed mine was making a funny noise under acceleration.
Decided to pull out the rear diff cuz thats where i heard the noise coming from. Looks like i rounded out a couple teeth on the driveshaft input gear and took metal off of about 12 of the "Big Gear" teeth on the inside of the diff. After closer inspection, it looks like the 4 screws holding the big gear onto the diff cup loosened just slightly and this is what caused it.
I knew i should have blue locktighted those when i rebuilt it last time. Kicking myself in the you know where right now.