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1956 GMC Trucks Gas & Diesel Model 550-970 Service Maintenance Manual Supplement

Price $22.95 $18.36 Details W: 8.25 x H: 10.75 x D: 0.375 Weight 0.91 lbs. Page Count 238 Condition Used Original - Good Item Type Factory Manual Inventory Number SM-26224 OEM Number X-5612 In Stock
Flat US shipping rate: $6.95
Flat International shipping rate: $34.95


1956 GMC Trucks Gas & Diesel Model 550-970 Service Maintenance Manual Supplement. Supplement applicable to X-5404.

A GM authorized manual that would have been used by a shop technician in their everyday duties of servicing/maintaining and repairing new and used vehicles of the time period. It gives short cuts and methods for the care and maintenance of GMC Trucks in simplistic terms. Note: These manuals were never meant as restoration manuals, as that is not within the regular scope of work done by dealership service departments.


Front Axle

Rear Axle

Cab and Body


Hydraulic Brakes

Air Brakes

Air Compressor and Governor (Midland Type)

Air Compressor and Gvoernor (Bendix-Westinghouse Tu-Flo)

Hand Brake

Brake Specifications


11-inch Dual Plate

14-inch Dual Plate

Cooling System


Wiring and Miscellaneous Electrical


Starting System

Ignition System



Lighting System

Electrical Specifications


Type 324 V-8 Engine

Type 503


Fuel System

Fuel Pump

Carburetor (Holley Model 4000G)

Carburetor (Holley Model 852FFG)

Carburetor (Holley Model 885JJG)

Carburetor (Zenith Horizontal)

Automatic Choke



Spring Suspension

Steering System

Michanical Steering

Power Steering


New Process

Spicer Models 6852 & 6853

Propeller Shafts

Hubs, Wheels, and Tires

Special Tools


Condition: Service Manuals have been used in Service Stations, Independent Garages and in Fleet Environments and thus reflect such use, most often showing signs of soiling and may show other signs of age and wear, but the information within is still legible and can give valuable insight in the care and maintenance of vehicles. The images shown are reflective of the of kind of condition one might find of manuals that are shipped.

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