Differential Steel Car Co. - 1931-1936 - Differential Co. - 1960-1970 - Difco Co. - 1970-present - Findlay, Ohio


The Differential company began building side dumping equipment for railroad and motor trucks in 1915, and introduced 3-way dump truck bodies in the 1920s. The truck that Differential recommended for this body was the 3-ton Graham Brothers, but in 1931 they decided to build their own chassis for use with their dump bodies. This was a conventional assembled truck powered by a 85 hp 6-cylinder Lycoming engine, with a 4-speed transmission and Timken spiral bevel rear axle. Load capacity was 2Yo to 4 tons. It was made until 1936, after which Differential made bodies only.

In about 1960 the company decided to make a complete truck again, this time a large, off-highway 6x4 model. It was designed to carry 30 tons of rock, sand or gravel, plus up to three additional30-ton short-wheelbase trailers for a total payload of 120 tons and a gross weight of 170 tons. All frames and bodies were of welded construction. The power unit was a Continental A VI 1790-8A air-cooled V12 of 825 hp driving through an Allison transmission with torque converter and Torqmatic brake; a slightly smaller Continental diesel was an optional alternative. Final drive was via a Timken-Detroit tandem axle with single reduction differential and final reduction through planetary gears in each wheel. Internal expanding air brakes and power steering were standard. Total length of the Wagon Train was 86 feet. R W



For more information please read:

G.N. Georgano & G. Marshall Naul - The Complete Encyclopedia of Commercial Vehicles

Albert Mroz - Illustrated Encyclopedia of American Trucks & Commercial Vehicles

Denis Miller - The Illustrated Encyclopedia of Trucks and Buses

Tad Burness - American Truck Spotter's Guide, 1920-1970

Tad Burness - American Truck & Bus Spotter's Guide, 1920-1985

Robert M Roll - American trucking: A seventy-five year odyssey

David Jacobs - American Trucks: A photographic essay of American Trucks and Trucking

David Jacobs - American Trucks: More Colour Photographs of Truck & Trucking

John Gunnell - American Work Trucks: A Pictorial History of Commercial Trucks 1900-1994

George W. Green - Special-Use Vehicles: An Illustrated History of Unconventional Cars and Trucks

Daniel D. Hutchins - Wheels Across America: Carriage Art & Craftsmanship

Ronald G. Adams - 100 Years of Semi Trucks

Stan Holtzman - Big Rigs: The Complete History of the American Semi Truck

Stan Holtzman & Jeremy Harris Lipschultz - Classic American Semi Trucks

Stan Holtzman - Semi Truck Color History

Donald F. Wood - American Beer Trucks

Donald F. Wood - Beverage Trucks: Photo Archive

Donald F. Wood - Commercial Trucks

Donald F. Wood - Delivery Trucks

Donald F. Wood - Dump Trucks

Donald F. Wood - Gas & Oil Trucks

Donald F. Wood - Logging Trucks 1915 Through 1970: Photo Archive

Donald F. Wood - New Car Carriers 1910-1998 Photo Album

Donald F. Wood - RVs & Campers 1900-2000: An Illustrated History

Donald F. Wood - Wreckers and Tow Trucks

Gini Rice - Relics of the Road

Gini Rice - Relics of the Road - Impressive International Trucks 1907-1947

Gini Rice - Relics of the Road - Keen Kenworth Trucks - 1915-1955

Richard J. Copello - American Car Haulers

Niels Jansen - Pictorial History of American Trucks

John B. Montville - Refuse Trucks: Photo Archive

Bill Rhodes - Circus and Carnival Trucks 1941-2000: Photo Archive

Howard L. Applegate - Coca-Cola: Its Vehicles in Photographs 1930 Through 1969: Photo Archive

James T. Lenzke & Karen E. O'Brien - Standard Catalog of American Light-Duty Trucks: 1896-2000

James K. Wagner - Ford Trucks since 1905

Don Bunn - Dodge Trucks

Fred Crismon - International Trucks

Don Bunn - Encyclopedia of Chevrolet Trucks


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