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I bought both GM shop manuals when I bought my '69 many years ago. The Service manual covers maintenance, e.g., R&R of components and adjustments and minimal troubleshooting; the Overhaul manual provides very detailed info on how to rebuild (overhaul) major compenents like transmissions, steering gear mechanisms, etc. If you buy rebuilt /new assemblies you could probably get away w/ the service manual only. If you like to tear things down and rebuild them yourself the Overhaul manual is good to have and has good listings of measurements and tolerances. I used to write operation and maintenance manuals for things like mass transit electronic control systems and other instrumentation back when we actually made things n this country, so I appreciate folks who, like myself, use the manual. :thumbs:
They are two different animals. The service manual has remove/inspect/reinstall-or-replace routines, while the overhaul manual gets into the details of hardcore rebuilds. I have'em both, and I think they are extremely helpful!
I got both for my '73. The Service Manual covers most "service" items. The Overhaul manual gets into the complecated jobs such as the A/C compressor, carbs, power steering gear, and the finer points of engine overhaul.
Get both plus the AIM (assembly instruction manual) and you will not need any others.
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