1942 Studebaker US6
U-4 2.5-ton 6x6 Truck

The Studebaker US6 (G630) was a series of 2½-ton 6x6 and 5-ton 6x4 trucks manufactured by the Studebaker Corporation (and REO Motor Car Company) during World War II. The basic cargo version was designed to transport a 5,000 lb (2,300 kg) cargo load over all types of terrain in all kinds of weather. Most of these were exported to the Soviet Union under Lend-Lease by the USA during World War II, since the competing GMC 6x6 CCKW design proved to be more suitable for Western Front conditions.

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The Studebaker US6 carried the design of Studebaker's civilian truck cab, although it was modified for military use. These were different from other 2.5 6x6 trucks built for the war effort of the USA because vent windows were included in each door. These vent windows were separate from the main window that rolled down into the door-frame and could be swung out to help with the truck cab's ventilation.

In April 1941, with World War in Europe on the horizon once more, the U.S. government entered into a contract with the Studebaker automobile company to begin producing 2.5-ton class military trucks out of its factory in South Bend, Indiana. The three major 2.5-ton American truck producers of World War 2 -General Motors, International Harvester Company and Studebaker - made about 900,000 trucks in all with GM and IHC providing their product to the U.S. Army, Navy and Marine Corps and Studebaker manufacturing 197,678 trucks for Lend-Lease - these primarily ending up with the Red Army of the Soviet Union. The plan, then proposed by President Roosevelt, was to "lend" or "lease" such military goods to any country whose security was vital to the defense of the United States. The Studebaker US6 saw manufacture from 1941 to 1945. The Soviet Union would become the largest foreign operator. The first Studebaker US6 trucks arrived in the USSR in the autumn of 1941. The Red Army organized a test of eleven 6x6 "Studebekkers" (as they become referred to in the USSR) which took place between July 1942 and May 1943. The results were used to direct the enlargement of the payload from ​2 1⁄2 tons (2,300 kg) to 4 tons (3,600 kg).[4] In 1945, it was lowered to ​3 1⁄2 tons (3,200 kg, although on improved roads they could carry up to a maximum of 5 tons (4,500 kg).

Large numbers of Studebaker US6 trucks were supplied to the Soviet Union via the Persian Corridor in Iran under the USA's Lend-Lease program. The truck fulfilled many important roles in service with Soviet military forces during the war, such as towing artillery pieces and anti-tank guns and transporting troops over long distances. It was renowned for its overall ruggedness and reliability, including its ability to run on poor-quality fuel. The Soviet Red Army also found them to be a suitable platform for conversion into Katyusha rocket launchers, although this was not their main purpose. The truck became affectionately known as the Studer by Soviet troops and was even recognized of its importance (to the Soviet war effort) by Joseph Stalin, who sent a personal letter of appreciation to Studebaker, in which he thanked them for the superb quality of the US6 for Soviet service.

Studebaker US6 trucks were also used by the US military in the construction of the Ledo Road and the Alcan Highway in North America during WWII.

The U.S. Army used 100,000 or so GM CCKW and Studebaker US6 trucks to build the Alaska Highway during World War II. Not only were they used to build the "Alaskan Highway," but also were used in the decades afterward when Alaskans needed big powerful trucks for just about everything they did.

GENERAL DATA - Pending
Crew 2
Weight Net (lb)  
  Payload (lb)2,300 kg
  Gross (lb)10,000 lbs
Axle load (lb:)
  Empty front: rear (each)  
  Loaded front: rear (each)  
Tires Ply 12 Size 7.50x20 psi 70
  Tread, center to center front  
Shipping Dimensions uncrated    
Vehicle Dimensions ground clearance inches  
  Height inches 106
  Width inches 88
  Length inches 335
Shipping dimensions (cu ft) (sq ft)  
Electrical system volts  
  Batteries number  
  Type of ground positive
Capacities Fuel, 72 octane gasoline (gal) 40
  Cooling System (gal)  
  Crankcase (refill) (qts)  
Transmission (qts)  
Transfer (qts)  
Axles (front) (qts)  
Rear (each wheel) (qts)  
 Winch Oil Capacity (front) (qts)  
Rear (qts)  
Rear winch transmission (qts)  
Load capacity front (lbs)  
Load capacity rear (lbs)  
 Brakes Manufacturer Bendix- Westinghouse Air
 Parking Brake   Type Transfer
PERFORMANCE
Maximum gradability (%)  
Turning Radius (ft) Right 35 Left  
Fording Depth   (in)  
Angle of approach (deg) with winch without  
Angle of departure (deg)  
Fuel Capacity Average conditions gal 40
Cruising Range Average conditions (miles) 240
Maximum allowable speed (mph) 45
Number of speeds forward 5
Transfer Speeds 2
Engine
Manufacturer Hercules JXD
Type valve in head L-head In-line Cylinders 6
Displacement (cu in) 320
Bore (inch)  
Stroke (inch)  
Governed speed (rpm)  
Horsepower 86 @ 2800 rpm
Torque 200 lbf-ft
Maximum recommended toward load gross (lbs) 25,000
ADDITIONAL DATA
Frame ladder frame 3 beam axles
Suspension front semi elliptical leaf springs rear tandem on quarter elliptical leaf springs with locating arms
Transmission Type: Warner T 93 5 speed with Timken T-79 high/low transfer case

You can find many of these trucks today in both North America, Europe and Russia due to the vast numbers produced then further utilized by civilians in numerous tasks throughout the world.

All specifications noted on the info pages for each vehicle are shown "as known." If you have corrections or input concerning any of the vehicles we would love to hear from you! Please contact us via the "Contact Us" menu item at the top of the page.