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So I started working on pulling the motor from my Montana GMC this weekend. The transmission was stuck in gear and I didn't have any luck getting the old crashbox to pop into neutral even with a 4x4 post/hammer. At this point, I couldn't tell the condition of the rear end or the motor so I needed to separate the 3. I pulled the motor out and discovered the rear end is still fully locked up which isn't that big a deal since I already have a new rear end. once I got the transmission separated from the engine, the engine was also locked up. Based on the casting numbers, it is not the original motor to the truck. The head also has a later casting date than the block. I got to work stripping the block down to see if I could find the reason that it was locked up and after a couple hours I got the head off to discover this disaster.