Take out the battery box to give yourself some room. Knock out the spirol pin that connects the front rag joint coupler to the driveshaft and slide it backwards on the shaft. Unbolt the flex discs, slide them back. Remove the 3 bolts that hold the driveshaft coupler/pilot bushing onto the crankshaft pulley. They are metric and you'll probably have to hit the wrench with a hammer to loosen them and retighten them when you're done. You can now move that to one side or another or wherever you can get it to clear, and then you'll have room to sneak the belt off and a new one on. Reassembly is the reverse of disassembly.
I'm not going to lie: this is a major PITA...I've had two diesels, and I hate changing alternator belts. Thankfully, I won't need to for awhile now.
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