Cheapskate1229, If you are really serious about finding manuals other than the original/reproduction GM publications,
there are a few still out there like this one if you search enough. If you check out the linked book, there is a picture of the "Condensed List" of vehicle info packed into that book. The vast majority being car info with a smattering of truck and even tractor info.
FWIW, When I first started working on cars and trucks in my teens, Chilton's books were the cheap and easy to find "go to" for repair reference material. You could even find them at the public library. I still have several from back in those days, although I haven't used them in decades because as others have said, they are very limited on the details and information as they tried to cram so much into each book.
I too am a firm believer in getting GM original or reproduction Shop/Operators Manuals, Factory Assembly Manual and I would also suggest you consider getting at least 1 Master Parts Catalog that covers your truck. Many times the exploded diagrams that can be found in a Master Parts book can provide more details and understanding of how parts and assemblies go together and have helped me identify stuff that was missing or incorrect for my truck.
On that note, there are lots of resources on line where you can get "free" access to these very same publications.
Keith Hardy's "OLD ONLINE CHEVY MANUALS" web page is just one example. It has links to tons of reference material to help you work on your truck. You just need to take to the time to click through the various offerings and look for the details you need. If all else fails, keep asking questions in the forums as its more likely than not that someone has dealt with whatever you may need help with!
