Clunk when starting

[pdxrealtor]

So- I've got this clunk upon start up. Almost positive it's coming from the transfer case.

It only occurs after it's sat for the night.

I'm pretty sure it's only happening when parked nose facing downhill incline. (still working on verifying this)

It only started happening after I did the TC fluid change.

The truck was level when I did the fluid change. I used Redline DT4.

Does it need more fluid maybe? I went through the recommended amount and it did come out of the fill hole while filling up.