T43 – Six pilot vehicles produced in 1951.

T43E1 – 300 built in 1953.

T43E2 – Two vehicles produced from 1955–56.
Turret basket and gunner moved to front of turret.
New targeting system (T52 rangefinder, T33 computer, T44 gunners periscopic sight) and hydraulic turret traverse replaced with electric
M103 – Produced in 1957.
74 converted into other models.

M103A1 Produced in 1959.
219 converted or rebuilt.
New sight (Stereoscopic T52) and M14 ballistic computer.
Removed one coaxial machine gun.
New turret electric amplidyne system traverse.
Turret basket.

M103A2 Produced 1964.
153 converted or rebuilt.
New 750 hp (559 kW) diesel engine from the M60 tank, increasing the road range to 295 mi (480 km) and maximum speed to 23 mph (37 km/h).
The M15 Stereoscopic Rangefinder is replaced to M24 Coincidence Rangefinder.

Heavy Recovery Vehicle M51 Initially built 1954–1955 and modified 1956–58 to bring up to standard.
Tank recovery version of the M103 heavy tank.
187 built by Chrysler.

Manned Evasive Target Tank M103A2s modified in 1977 for use as targets in training TOW missile crews (firing dummy warheads).
T43 – Six pilot vehicles produced in 1951.
T43E1 – 300 built in 1953.
T43E2 – Two vehicles produced from 1955–56. Turret basket and gunner moved to front of turret. New targeting system (T52 rangefinder, T33 computer, T44 gunners periscopic sight) and hydraulic turret traverse replaced with electric
M103 – Produced in 1957. 74 converted into other models.
M103A1 Produced in 1959. 219 converted or rebuilt. New sight (Stereoscopic T52) and M14 ballistic computer. Removed one coaxial machine gun. New turret electric amplidyne system traverse. Turret basket.
M103A2 Produced 1964. 153 converted or rebuilt. New 750 hp (559 kW) diesel engine from the M60 tank, increasing the road range to 295 mi (480 km) and maximum speed to 23 mph (37 km/h). The M15 Stereoscopic Rangefinder is replaced to M24 Coincidence Rangefinder.
Heavy Recovery Vehicle M51 Initially built 1954–1955 and modified 1956–58 to bring up to standard. Tank recovery version of the M103 heavy tank. 187 built by Chrysler.
Manned Evasive Target Tank M103A2s modified in 1977 for use as targets in training TOW missile crews (firing dummy warheads).
M103 (heavy tank)