The product is a Haynes workshop manual specifically for Dodge and Plymouth vans from 1971 to 1986. It covers all full-sized models and provides detailed instructions and diagrams for servicing and repairing these vehicles. Published by Haynes, known for producing reliable automotive manuals, this book is a valuable resource for owners and mechanics looking to maintain or fix these classic vans. It includes information on routine maintenance, troubleshooting, and specific repair procedures for different models within the specified years.