1983 Ford Truck B-Series B-600 B-700 B-7000 School Bus Chassis Sales Brochure. Look to Ford's line of B-Series Chassis to provide economical school bus service. There's a chassis in the size you need, equipped to your exact specifications. Gas, LP-Gas, or diesel provides the fuel economy tight budgets demand. The B-Series meets or exceeds National Education Association standards. Includes chassis selector and specifications. Highlights Fuel Pincher Diesel, 3208 Series Diesel and Econolines for School Buses on the back.