Since nobody could chime in on my question I dove into it on my own. I'd like to start by saying that after owning at least 10 AE vehicles this will the last as I move on to another brand. The clattering under acceleration had thinking spur gear or failed diff gear. Upon instection of spur, trans gears, center diff, and rear diff I found no damage yet but the diffs were bone dry, the fit and finish sucks, the design sucks, the bearing going out the front trans shaft sucks to get into place. All I left is the front but am yet to find the problem. It took me longer to check truck than my E-revos which I thought were the pinicle of junk to work on. I like the size of the and it doesn't handle too bad but working on it is bad and parts are low quality. Not even any sign of grease in the diffs pissed me off.