|This article does not cite any references or sources. (February 2014)|
Studebaker US6 model U2
|Type||2 1⁄2 ton Cargo truck|
|Place of origin||United States|
|Number built||197,678 (+ 22,204 by Reo)|
|Weight||10,485 lb (4,756 kg)|
|Length||265 in (670 cm)|
|Width||88 in (220 cm)|
|Height||88 in (220 cm)|
320 cu in (5.2 L) I6
86 hp (64 kW)
|Suspension||wheels, 6x4 and 6x6|
|Speed||45 mph (72 km/h)|
|This section requires expansion. (February 2014)|
In 1940 the US Army set a requirement for a 6x6 truck with a 12 ft (3,658 mm) cargo area and 2 1⁄2 ton (2,268 kg) off-road payload. Studebaker and Yellow Coach (a GM brand) submitted very similar models, with many shared components, while International Harvester submitted its own unique design. All three were accepted and in production by 1941.
Production was divided between Studebaker producing for Lend-Lease, Yellow (later GMC) producing for the US Army, and International Harvester producing for the US Navy & Marines. These three primary manufacturers produced over 900,000 2 1⁄2-ton trucks in all, in both 6x4 and 6x6 axle/wheel versions, with approximately 200,000 Studebaker trucks built in thirteen variations, including dump truck and tractor models.
Engine and driveline
The US6 used a Hercules JXD engine, an I6 L-head with 86 hp (64 kW) at 2800rpm and 200 lbf·ft (271 N·m) at 1150rpm. A 4 in (102 mm) bore by 4 1⁄4 in (108 mm) stroke gave 320 cu in (5.2 L) in a conservative and reliable engine. With a compression ratio of only 6:1 it could use very low octane gasoline. This engine was also used in the M3 and later M8/M20 armored cars.
The transmission was a Warner T 93 5 speed with a direct 4th gear and overdrive 5th gear. The transfer case had high and low gears, and engaged the front axle. In 6x4 models it was blocked in high and did not drive the front axle. Both front and rear axles were a Timken split type. The transmission was also used by CCKWs, as were many transfer cases and axles.
Body and chassis
The US6 used Studebaker’s civilian truck cab, modified for military use. Studebaker trucks were unique from other 2 1/2 ton trucks built for the war effort because vent windows were included in each door. These windows were separate from the window that rolled down into the door and could be rotated out to help with ventilation.
Studebaker designed the open military cab also used by the CCKW, but their major customer, the U.S.S.R, preferred the closed cab for their climate. While Studebaker's open cab became the US standard, the US6 returned to the closed cab after only 10,000 units.
The US6 was built on chassis with two wheelbases, 157 in (399 cm) long wheelbase (LWB) used in most models, and the 148 in (376 cm) short wheelbase (SWB), used in semi tractors and dump trucks. All models had 7.50-20” tires and dual rear tires.
The US6 series includes the following:
|U1||Cargo with 12 ft (3.7 m) bed||SWB|
|U2||Cargo with winch||SWB|
|U3||Cargo with 17 ft (5.2 m) bed||LWB|
|U4||Cargo with winch||LWB|
|U5||750 US gal (2,800 l) tanker||LWB|
|U6||5 ton 6x4 Semi tractor||SWB|
|U7||5 ton 6x4 Cargo with 17 ft (5.2 m) bed||LWB|
|U8||5 ton 6x4 cargo with winch||LWB|
|U9||Cab and chassis (w/o winch)||LWB|
|U11||Rear dump with winch||SWB|
|U13||Side dump with winch||SWB|
Large numbers of Lend-Lease Studebaker trucks were sent into the Soviet Union via the Persian Corridor. The Soviets found them a good platform for "Stalin Organ" Katyusha rocket launchers, although it was not their prime use in the Soviet Union. It fulfilled many roles in the Red Army, such as pulling artillery and was renowned for its ruggedness and reliability. The truck was affectionately known as the Studer by Soviet troops.
- Katyusha rocket launcher
- M35 2½ ton cargo truck
- List of U.S. military vehicles by supply catalog designation
- List of U.S. military vehicles by model number
- Chevrolet G506 trucks
- GMC CCKW
- Department of the Army (1943). TM 9-807 War Department Technical Manual.
- SNL G630[clarification needed]
- Studebaker/Reo US6 2.5 Ton Cargo Truck images and details
- Australian Studebakers US6
- US 2.5-ton 6x6 Trucks in World War II
- Studebaker/Reo US6 at The-Bluprints.com
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