United States Army trucks

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In 1915 the US Army started testing trucks that were made to go off-road. Could they replace horses? Trucks could carry bigger loads and were easier to take care of. A truck can run as long as it has fuel and a good truck should not break. A horse has to be fed, rested, and can get sick. The tests showed the trucks were better than horses. The Army started replacing all horses and mules with trucks. One of the testers, Lieutenant Dwight D. Eisenhower, later became the President of the United States and started the Interstate Highway System.

FWD convey in Mexico, 1916
HEMTT and HMMWV, 2014

Overview[change | change source]

Army trucks are [measured by how many tons (907 kg) a cargo model can carry (The same truck can have different bodies). They also measure the number of wheels that drive. Off-road trucks have all the wheels driving. 2 axles are 4x4, 3 axles are 6x6, and 4 axles are 8x8. (Dual tires are counted as one wheel).

Until the 1990s most Army trucks had the engine in front of the cab. In the US this is called "convential". In Great Britain this is called "bonneted". In the 1990s the Army changed to new types. Most new types can have an armored cab. Medium and large trucks have the cab over the engine ("COE"). The front of the cab looks flat. Most trucks in Great Britain and Europe are COE. A new large size truck has the cab in front of the engine ("forward control"). There are two axles under the engine. Both axles steer.

The Army uses the same parts in many trucks. They also use different parts in the same truck. A truck engine, transmission, and other parts can be from different companies. Different builders can build the same trucks.

The Army still uses many old trucks. They were built very strong and can be fixed with new engines and transmissions. The Army also uses civilian trucks. Large semi-tractor with three rear axles tow tanks on trailers. Civillian medium and heavy trucks (some with armored cabs) are also used.

The US Marines use many Army trucks but they also have their own types.

Mechanical[change | change source]

Engines[change | change source]

The Army used gasoline engines until the 1960s (in Great Britain gasoline is called "petrol"). In the 1960s they started switching to diesel engines. Some ("multi-fuel") could use some gasoline or jet fuel mixed in with the diesel fuel. Now the Army uses the same diesel engines as civilian trucks.

Almost all trucks have water-cooled inline 6 cylinder (I6) engines. Jeeps have inline 4 cylinder (I4) engines. Some ​1 14-ton trucks have V8 engines. There are a few strange engines.

Transmissions[change | change source]

Almost all old Army trucks had manual transmissions. Now most have automatic transmissions. A transfer case is mounted behind the transmission. It sends power to the front axle. In manual transmission trucks it has a very "low" gear that can go very slowly on bad ground. Automatic transmission trucks do not need a "low" gear.

Chassis[change | change source]

A "ladder frame" had two rails going front to back with smaller rails connecting the two (it looks like a ladder). A front solid driving axle was mounted on leaf springs. Tandem (two axles together) axles are mounted differently. They have leaf springs and arms to hold the axles. Some have the spring over the axles. Some have the leaf springs below the axles. A few extra-heavy duty models use a simple but stronge "walking beam" type.

History[change | change source]

1915-1939[change | change source]

In 1914 World War I started in Europe and the British began buying American trucks. Trucks like the "Bulldog" Mack were good but roads in Europe were muddy and bad.

In 1915 the Army was chasing Mexican revolutionary Pancho Villa in Texas and Mexico. 4x4 trucks by the FWD Company and Jeffery Company were tested and passed. They were built for World War I. Each truck was also built by three other companies.

The Army liked more than one company building the same trucks. More could be built. If one company had problems the other companies could keep building the trucks. A standard "Liberty" truck was built by 15 different companies. But most trucks in World War I were made from many small companies and broke down.

In the 1920s the Army built and tested a few trucks. The truck builders didn't do much. Then in 1930 the Army built an test group of trucks. The "Standard fleet" had different sizes. They were strong and reliable but only test trucks were built. The American truck builders said the Army was taking their business away. The Army had to stop building trucks. It was the Great Depression and the Army had very little money for trucks. Builders starting making test models in 1935. By 1939 more than 20 builders had made and improved test models.

1940-1949[change | change source]

In 1940 the Army wanted all new off-road trucks. They wanted ​14, ​12, ​1 12, and 5-ton 4x4s. They also wanted ​2 12, 4, 6, and ​7 12-ton 6x6s. Trucks were tested and changed. Good trucks were built in large numbers. Some good trucks were built by more than one company. (6-ton trucks were built by 5 companies). In some sizes more than one type were built. There were 3 different ​2 12-ton trucks built. Trucks were named after their builder and model. Sometimes they are named by their size and powered wheels (​2 12-ton 6x6). "M" numbers name the body.

During World War II the US made a large number of trucks and loaned many to other allied countries. In 1945 all truck building ended. With the war over there were too many trucks to use. Many were left with the countries that used them. "Jeeps" and "​2 12-ton" trucks could be found all over the world. Most were used by armies, but some were sold to civilians.

1950-1979[change | change source]

After World War II new trucks were planned. Many trucks had worked well, but there were too many types. Companies built their own types. The Army wanted types that anybody could build. They also wanted fewer types. There would be ​14 and ​34-ton 4x4s and 2½, 5, and 10-ton 6x6s. Trucks used many of the same parts. All large trucks used the same cab. The fenders and hoods looked the same.

1950 is when "M" numbers started naming the truck and body. Every truck, with every body, has it's own number. (A M35 is a cargo truck and a M36 is the same truck with a longer cargo body).

These types didn't change much for 25 years. A new "Jeep" (M151) was used from 1960. The ​34-ton changed to a civilian type ​1 14-ton size. The larger trucks were fixed up but were still the 1950s types.

1980-2015[change | change source]

In the 1980 the Army began using new truck types. Truck types began to be named with letters. Most can be armored. Dual tires are no longer used on new trucks. On most trucks the tire air can go up or down while the truck is moving. This is called "Central Tire Inflation System" (CTIS).

The small truck is the ​1 14-ton HMMWV ("Hum-V" or "Hummer"). It started being used in 1983. It is made just for the Army. It is not a changed civillian truck.

The same European type trucks are used for ​2 12 and 5-ton sizes. The ​2 12-ton size has 2 axles (4x4) and the 5-ton size has 3 axles (6x6). Most parts are the same for both.

A new very heavy duty 10-ton 8x8 (4 axles) was built just for the Army. They have many bodies and some can be changed. Many have cranes to load the truck.

Truck models (not all are here).[change | change source]

14-ton "Jeep"[change | change source]

Name Years Built Total built Notes
Willys MB[a] 1941-1945 639,000+
M38A1 (Willys) 1952-1971
M422 "Mighty Mite" 1959-1962 3,922 USMC very light utility
M151 (Ford) 1960-1988

34 to ​1 14-ton[change | change source]

Name Years Built Total built Notes
Dodge WC 1941-1945 255,000+ 10+ bodies
M37 Series (Dodge) 1951-1968 115,838 "Power Wagon"
M715 (Kaiser-Jeep) 1967-1969
M880 (Dodge) 1976-1977 Civillian pickup truck
M1008 CUCV[b](Chevrolet) 1984-1987 Civillian pickup truck
M998 HMMWV[c] 1983 Can be armored

1 12-ton[change | change source]

Name Years Built Total built Notes
Chevrolet 7100 (G509) 1940-1945 168,603 15 bodies
M561 "Gamma-goat" 1970- 14,000 6x6 (2 truck axles and one trailer axle)

2 12-ton[change | change source]

Name Years Built Total built Notes
GMC CCKW[d] 1941-1945 562,750 "Deuce and a Half", "Jimmy"
GMC DUKW[d] 1942-1945 21,147 "Duck" amphibious CCKW
Studebaker US6[e] 1941-1945 219,882 8 bodies
M35 (GMC) 1950-1988 8+ bodies
M35 (REO)[f] 1950-1991 Standard medium truck 1950-1991
M1078 LMTV[g][h] 1991- Family of Medium Tactical Trucks 4x4

4 to 6-ton[change | change source]

Years Built Total built Notes
Diamond T 968
4-ton 6x6
1940-1945 30,000 Cargo, dump, wrecker
and specialty bodies
5-ton 6x6
1990-1982 Standard heavy truck 1950-1991
M1083 MTV[i][h]
5-ton 6x6
1991- Family of Medium Tactical Trucks 6x6
Autocar U8144T
5 to 6-ton 4x4
1941-1945 2,711 semi-tractor for pontoon bridges
Brockway B666[j]
6-ton 6x6
1941-1945 219,882 Bridge, crane, cargo, fire, van, and others.

Larger trucks[change | change source]

Years Built Total built Notes
M123 (Mack[k])
10-ton 6x6
1955-1969 4,132 semi-tractor tank transporter
M977 HEMTT[l]
10-ton 8x8
M20 (Diamond T)
12-ton 6x4
6,554 Tractor tank transporter, diesel engine, no front wheel drive,
M26 (Pacific)
12-ton 6x6
1943-1945 1,372 Semi-tractor tank transporter
(armored and unarmored models)

1915-1935[change | change source]

Years Built Total built Notes
Jeffery Quad
2-ton 4x4
1913-1928 11,000 Early ones had 4-wheel steering
FWD Model B
3 to 5-ton 4x4
1912-1920 16,000
Standard Group II
3 to 4-ton 4x4
1931-1932 60[m] Entire line of test trucks

Notes[change | change source]

  1. also built by Ford Ford
  2. Commercial Utility Cargo Vehicle
  3. High Mobility Multipurpose Wheeled Vehicle
  4. 4.0 4.1 also built by Chevrolet
  5. Also built by REO
  6. 6.0 6.1 Standard design built by many conmpanies.
  7. Light Medium Tactical Vehicle
  8. 8.0 8.1 (Stewart & Stevenson)
  9. "Medium Tactical Vehicle
  10. Also built by Corbitt (designer), FWD, Ward LaFrance, and White (who built the most)
  11. Also built by CONDEC with Mack transmission/transfer cases and axles
  12. Heavy Expanded Mobility Tactical Truck
  13. 60 of all test models

References[change | change source]

  • Crismon, Fred W (2001). US Military Wheeled Vehicles (3 ed.). Victory WWII Pub. ISBN 0-970056-71-0.
  • Doyle, David (2003). Standard catalog of U.S. Military Vehicles. Kraus Publications. ISBN 0-87349-508-X.
  • Vanderveen, Bart (1998). A record of military Macks in the Services and beyond. After the Battle. ISBN 1-870067-09-6.
  • Ware, Pat (2014). The Illustrated Guide to Military Vehicles. Hermes House. ISBN 978-1-78214-192-1.
  • TM 9-2800 Standard Military Motor Vehicles. US Dept. of the Army. 1943. Retrieved 8 Aug 2017.
  • TM 9-2800 Military Vehicles. US Dept. of the Army. 1947. Retrieved 8 Aug 2017.
  • TM 9-2800 Military Vehicles. US Dept. of the Army. 1953. Retrieved 8 Aug 2017.
  • Standard Military Vehicle Data Sheets. Ordnance Tank Automotive Cmd. 1959. Retrieved 8 Aug 2017.
  • Illustrated Equipment Data. US Dept. of the Army. 1997. Retrieved 8 Aug 2017.