Motor Carriage, (T70) M19 Gun Motor Carriage,(T65E1) M20 ? Motor Carriage M21 Mortar Motor Carriage M22 ? Motor Carriage M23 ? Motor Carriage M24 ? Motor Carriage M25 ? Motor Carriage M26 ? Motor Carriage M27 ? Motor Carriage M28 ? Motor Carriage M29 ? Motor Carriage M30 ? Motor Carriage M31 ? Motor Carriage M32 ? Motor Carriage M33 ? Motor Carriage M34 Gun Motor Carriage 40 mm halftrack (T160)?? M35 ? Motor Carriage M36 Gun Motor Carriage,(T71E1) M37 105 mm Howitzer Motor Carriage, (T76) M38 ? Motor Carriage (M38 Wolfhound, 37 mm, 6 × 6?) M39 ? Motor Carriage M40 Gun Motor Carriage M41 Howitzer Motor Carriage M42 Gun Motor Carriage (Duster) M43 Howitzer Motor Carriage M44 Self Propelled Howitzer (T99) M45 Self Propelled ? M46 Self Propelled ? M47 Self Propelled ? M48 Self Propelled ? M49 Self Propelled ? M50 Self Propelled Rifle(T165)(Ontos) M51 Self Propelled ? M52 Self Propelled Howitzer (T98) M53 Self Propelled Gun (T97) M54 Self Propelled ? M55 Self Propelled Howitzer M56 Self Propelled Gun(T101) (Designation jumps to M100 series) Armored Cars M1 Armored car (G29) Model T4 Cunningham (1934) M2 unknown M3 unknown M4 unknown M5 Armored car (G134) (T17 Deerhound) M6 Armored car (G122) (T17E1 Staghound) M7 Armored car (G133) (T18 Boarhound) M8 Armored car (G136) (Greyhound) T22 (M9 halftrack car)? M10 redesignated M20 Armored Utility Car T26 (G176) M38 Wolfhound, 37 mm, 6 × 6 Scout cars M1 scout car (G31) M2 Scout car (G32) M3 Scout Car (G67) M4 Scout car (G66) Half-tracks M1 car, Halftrack, (T1E1) 1933, Cadillac 8-cylinder, 115 HP. (33 produced) M2 half-track truck, (T9) (Ford) M2 half-track car, (T14) Autocar, White Motor Co. M3 half-track, Autocar, White Motor Co. M4 81 mm Mortar Carriage M5 half-track variant of M2 half-track car built by International Harvester M9 half-track car M15 half-track Multiple Gun Carriage built by Autocar M21 mortar carrier, 81mm Pre-consecutive tractors M1 Light Tractor M1 Medium Tractor M1 Heavy Tractor M2 Light Tractor M2 Medium Tractor M2 Heavy Tractor Tractor cranes M1 tractor crane, 1-ton, (G108)- International Harvester, T-6 M2 unknown M3 tractor crane, 2-ton, (G69) - Caterpillar D6 M4 tractor crane, 6-ton, (G126) - Caterpillar D7 M5 tractor crane, 2-ton, (G99) - International Harvester T-9 High-speed M1 unknown M2 High Speed Tractor (G111) M3 unknown M4 Tractor, full-track, high-speed, 18-ton (G150) M4A1 Tractor, full-track, high-speed, 18-ton M4A1C Tractor, full-track, high-speed, 18-ton M4A2