Good original Chevrolet, Cadillac and GMC Dealer Service Manual Set. These are the Volume 2 [Engine] and Volume 3 [Transmission] Manuals. These Manuals cover the CK Truck Models [ Tahoe, Suburban, Avalanche, Yukon and Escalade ]. These were used by the Dealership to Service and repair your Truck. They include information, specifications, procedures, illustrations, diagrams and trouble shooting for your vehicle. Very informative and useful tool that is hard to find since they were not available to the public.