| Year | December 1942 |
| Vehicle Type | [@type] |
| Origin & Designer | [@designer] |
| Numbers Produced | 509 |
| Crew | 6 |
| Armament | 2 x .30 cal M1919A4 M.M.G.s |
| Ammunition Carried | 2000 x .30 cal |
| Pay Load | [@pay_load] |
| Towed Load | [@towed_load] |
| Weight | 29.770 kg |
| Height | 3.02m |
| Width | 2.72m |
| Length | 5.64m |
| Ground Clearance | 0.61m |
| Fording Depth | 1.0m |
| Obstacle Clearance | 0.61m |
| Climbing Ability | 31° |
| Radio | SCR 508 |
| Armour | Hull Gun Mantlet: 89mm. Upper Hull Front: 51mm. Lower Hull Front: 51mm. Upper Hull Sides: 38mm. Lower Hull Sides: 38mm. Hull Rear: 38mm. Hull Top: 25mm. Hull Bottom: 13mm.br> Turret Gun Mantlet: 51mm. Turret Front: 51mm. Turret Sides: 51mm. Turret Rear: 51mm. Turret Top: 22mm. |
| Engine | Wright (Continental) R975 C1 |
| Transmission | 5 Forward & 1 Reverse |
| Maximum Road Range | 119 miles (193 km) |
| Maximum Cross Country Range | 87 miles (140 km) |
| Maximum Road Speed | 21 mph (34 kph) |
| Maximum Road Speed + Trailer | [@maximum_road_speed_trailer] |
| Maximum Cross Country Speed | 16 mph (25 kph) |
| Maximum Road Towing Speed | [@maximum_road_towing_speed] |
| Variants | [@variants] |
| Notes | The M31 was an early attempt by the US military to develop a tank recovery vehicle. The vehicle was based on the chassis of the M3 medium tank. These were surplus models which had been replaced as a battle tank by the M4. As a part of the conversion they stripped the vehicle of all its main weapons except for the bow machine gun. The turret was reversed and had a dummy gun attached rear. Another dummy gun was welded on the old gun sponson which was now a door. It had a crane attached to the turret front, this along with booms and jacks could lift up to 27.000 kg. |