| Year | June 1944 |
| Vehicle Type | [@type] |
| Origin & Designer | [@designer] |
| Numbers Produced | 254 |
| Crew | 5 (Commander, Gunner, Loader, Driver & Assistant Driver) |
| Main Armament | 1 x 75mm L/40 M3 or 76mm L/55 M1A1 Gun |
| Main Armament | [@sponson_traverse] |
| Elevation | -10° to +25° |
| Turret Traverse | 360° (Powered) |
| Gun Traverse | [@gun_traverse] |
| Gun Mount | [@gun_mounts] |
| Maximum Range | [@maximum_range] |
| Armour Penetration | [@armour_penetration] |
| Gun Sight | [@gun_sight] |
| Secondary Armament | 1 x .50 cal M2HB Heavy Machine Gun (AA Mount). 1 x .30 cal M1919A4 Machine Guns (Coaxial). 1 x .30 cal M1919A4 Machine Gun (Bow). |
| Smoke Discharger | [@smoke_discharger] |
| Ammunition Carried | 104 x 75mm & 300 x .50 cal + 6.250 x .30 cal & 12 x Smoke |
| Height | 2.95m |
| Width | 2.94m |
| Length | 6.27m |
| Combat Weight | 38.000 |
| Ground Clearance | 0.43m |
| Fording Depth | 1.0m |
| Trench Crossing | 2.30m |
| Obstacle Clearance | 0.61m |
| Climbing Ability | 30° |
| Radio | SCR 508/528/538 |
| Armour | Upper Hull Front: 140mm. Lower Hull Front: 102mm. Upper Hull Sides: 38mm. Lower Hull Sides: 76mm. Hull Rear: 76mm. Hull Top: 25mm. Hull Bottom: 13mm. Gun Mantlet: 178mm. Turret Front: 152mm. Turret Sides: 152mm. Turret Rear: 152mm. Turret Top: 25mm. |
| Engine | Ford GAA (Petrol) |
| Transmission | 5 Forward & 1 Reverse |
| Maximum Road Range | 100 miles (161 km) |
| Maximum Cross Country Range | 68 miles (110 km) |
| Maximum Water Range | [@maximum_water_range] |
| Maximum Road Speed | 24 mph (39 kph) |
| Maximum Cross Country Speed | 15 mph (24 kph) |
| Maximum Water Speed | [@maximum_water_speed] |
| Variants | [@variants] |
| Notes | This heavy weight version of the M4 was designed as an assault tank to breech prepared defences. By this stage of the war the US army still lacked a heavy tank which could absorb punishment and support the Infantry in frontal attacks against German strong points. The M26 was still being developed so an interim vehicles was needed. The M4 was a readymade candidate and was heavily up-armoured with 140mm hull and 152mm turret armour, this reduced the speed down to 24 kph. The first Jumbo’s saw action in October 1944 and the first tank to breakthrough to the defenders in Bastogne was a M4 Jumbo. |