Chilton, Haynes, and Clymer are **** once you've seen a real OEM manual. I sold them for a decade - I'll never touch one of the others again. Chilton and Haynes have been recycling some pictures for over 30 years - how exactly that is helpful to you now on your vehicle is questionable.
the simple fact that an aftermarket manual is at most 100 pages and the factory shop manual for 04 from GM is likely 4 volumes... as in book 1 through book 4 each more than 200 pages is telling.
Almost all manufacturers have stopped printing paper manuals now - last I was involved in the industry it was Ford still pushing them on every dealer and GM printed on demand if a dealer wanted them while most dealers prefer electronic versions. Chrysler stopped paper in 08, Nissan I believe was 04, toyota IIRC was 02-04. If you're a pro wrench who's been working on cars for a while you can get by with a non oem book since you already know a lot of who systems work and can figure out what needs to be done, but you're not going to get efficient at repairing it or be able to cover every possible issue without a FSM and/or an excellent group of very well versed people in your vehicle. (vehicle specific active forums)
It's possible to find the book online free but if so it's there illegally. None of the auto manufacturers has released service manuals for free and they do actively hunt for and prosecute copyright infringement.
Keep in mind paper manuals cost dealers on the order of $500 per vehicle, and in this day with electronic service info in every dealer, FSMs are not flooding the market like they were when the big 3 Us manufacturers were having major dealer closings 5-8 years ago.
Look on eBay - if you want the manual and no issues go to Faxon auto literature in Cali or try Walter Miller in Syracuse. those are the 2 giants in the industry. The place I worked for closed and has been purchased but I don't know what name it will reopen under or when. Those 2 are "the" places to go in the US for automotive paper.
