Parts books are extreemly rare and pretty expensive when you do find them. I have the parts books for 80 - 86. I baught it from one of the dealers that specializes in that type of book on ebay. They cost me $140.00 for the pair, but well worth it. He had them up for auction, but no one met his reserve. I emailed him afterward and asked him just how much he wanted and that was his reserve price.
The parts manuals are about 3 inches thick each, one is an illustration book and showing the parts and basic part numbers, and the other contains the partnumber based on application, modle and year. So you find the part you are looking for in the first one and then go to the same section of the other book to find the actual partnumber for your vehicle. The parts guys love
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' /><' /> it when you show up with the actual part number and they don't have to do all the research.
Shop manuals on the other hand are advertised quite often. Again I have a complete set so for all five books, (volume A - Body, Chassis, Electrical; volume B - Engine, volume C - Pre-delivery, ***** Maintenance; volume HT Emissions Diagnosis; EVTM - Electrical Vacuum Troubleshooting Manual). Of these the single most valuable ones, atleast for me, has been the EVTM and volume HT. That doesn't mean the others aren't great also, just that I use those two volumes the most. The others have great blow ups showing all the parts say for example the engine or the axles, etc. I'm not sure what the five cost me but it was in the area of $35 - $40 apiece.
The one thing I will say for them all is that they are far superior to haveing a Haynes or Chiltons. Haynes and Chiltons, ( which I have both of), are a readers digest version of the shop manuals and for quick reference are OK but they don't get into the nitty gritty of the subjects they cover. Haynes and Chiltons are about 3/4 of an inch thick while the total of the shop manuals is about 10 inches and loaded with diagrams.
Well, all that dribble

. Go to ebay and search on Shop Manual and then EVTM. If you don't find your truck there, contact one of the advertisers and ask if they have the manuals but just don't have them listed yet. Even if they don't you can probably get them to alert you if they get a set.
Good luck,

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