Maybe there were pans produced by different suppliers causing the drain plug differences?I have heard of others having problems with it. The hex just slipped in the plug. I was able to rotate it slightly with a bolt extractor, but no joy. Broke out the left handed drill bits .
What I did have issue with that I wasn’t expecting was the coolant lines. Had to loosen the supports to push them out of the way to get the pan in.
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While removing/installing my pan was just a bit tight, I just had to slide it out/in tipping one end of the pan upward near the lines but I definitely did not have any problem.
These trucks should all be exactly the same?