I bought my service manual from these folks on ebay.
http://stores.ebay.com/Faxon-Auto-Li...&_sid=16948582
I sent them an email to confirm it covered the 4D55 and they confirmed that it was. Mine was for a 1984. They may have one specifically for a 1983. Just ask.
Otherwise the resource that Geezer gave you is also valuable and free. You just print off the pages that you need.
I'm personally interested to see what your AC bracket looks like. My truck has all the AC fixins for a gas model but the brackets are not the same. I either need to modify this one or make one that will work. I might hollar at you to get a picture of it. The 2WD diesel models with AC and power steering are not very common.
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