[AndysLog]

im not sure what you mean by the ecu has a built in tcm, the tcm is in the transmission, could you elaborate a little more?
normally cross contamination is a gradual thing. no reason for a thud to happen at all.
i suspect something else maybe the cause.

 

[AndysLog]

IDK, I would doubt that it would still move under its own power if the diff was completely gone so it may be the trans. Your friction plates may be worn out completely but the "thud" still gets me. The "thud" is uaually a tell-tale sign of a diff so idk.

Side Note: I wonder if it could be the Tcase? I also wonder if the diff would still work if the spider gears were sheared? I guess I will just have to wait to see what your mechanic says.

mine didnt.

I am not to sure either about the thud. It shook the cab and made our hearts skip a beat. I guess I will just wait to see what the dealership says and let you all know whats going on.

definitely keep us posted.