Here is how to fold down the backseat on a Chevrolet truck with an extended cab. If you have an old Chevrolet truck or GMC truck, and it has two doors and a jumpseat in the back, this is how to fold up the backseat or fold it down. To fold down the back seat on a Chevrolet Silverado truck, just use the lever on the passenger side of the seat on the bottom, and when you pull it you can put the seat up and back against the back of the cab, or fold the back of the seat down to build a little shelf behind the driver seat. This video shows you how to fold down the backseat on a Chevy Silverado or GMC pickup truck.
Here is where to get a repair manual for this Chevy truck.
https://amzn.to/2DucFZH