Finding original Chrysler factory service manuals takes more time and effort now than it once did. ebay is a good source. Thrift stores, flea markets, surplus dealers, and pawn shops can be another source. Online surplus book retailers used to have them, but a lot of those are gone. At one time, some public libraries had Chrysler factory service manuals on the shelves, and those could be purchased when surplused, but I doubt any are left.
Note that the 1972 model year Chrysler/Plymouth manual is a two volume set: Body Service Manual (document number 81-070-2150), and Chassis Service Manual (document number 81-070-2450). Often they are not sold together.
The following image shows the 1972 model year Chrysler/Plymouth manual set:
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Note that alternate versions of the manuals were available for the Plymouth Troubleshooting Contest, and Chrysler Troubleshooting Contest. These are the same book, just with different covers. The following image shows a Chrysler Troubleshooting Contest chassis manual for 1974. This is a Dodge version.
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A couple of the two volume sets at ebay are at the following links:
1972 Chassis/Body set
1972 Chassis/Body set
They are, unfortunately, pricier now.
I purchased my first Chrysler factory service manual direct from Chrysler in 1978 for $10. Then service manuals were available at $10 - $12.50 each for most from the current model year going back about 20 years. Similarly, owner manuals were available for $5. An order blank was in the back of any owner's manual. I bought several service and owner manuals. I also learned of the factory parts catalogs available, plus the heavy binders that dealers used and I got several. These were available, but not advertised to the public.
Since then, I have gathered service manuals and parts catalogs for all of my cars, and more, plus much Chrysler literature on multiple topics and vehicles, general Chrysler catalogs, Chrysler Service Highlights, Chrysler Technical Service bulletins, sales literature and a multitude of general automotive texts and manuals, aftermarket parts catalogs, etc.
I mostly do not buy reprints, but I have a couple of the early manuals that Year One provided. The print and diagrams were good, but the picture images were washed out some. The Torqueflite colored flow drawings are present. They used heavier paper, so the manuals are a little thicker, and their only marking added was inside the front cover.
The following images show most, but not all, of my Chrysler factory service manuals, Technical Service Bulletins (TSBs) books, and factory parts catalogs, ranging from the late 50s into the 90s:
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