Engines of the Red Army in WW2

75mm M2 gun with, 37mm M5 gun without counterweight

U.S.Medium Tank »M3 General Lee«, Late Production

Note 2 front stowage boxes for track grousers

Note different air cleaners

U.S.Medium Tank »M3 General Lee«, Late Production

During its production phase until August 1942, the early Medium Tank M3 »General Lee« underwent a couple of improvements.

The early main armament, the short-barreled 75mm M2 gun, subsequently received the new gyro stabilisation system causing the installation of a counterweight at the gun's end.
Such a mechanism was soon provided to the turret's 37mm M5 or M6 gun as well where the counterweight was placed beneath the gun.
Later, the original 75mm M3 gun replaced the M2 resulting in better performance.
The ventilation system was improved by two additional ventilators, one on top of the turret, the other on top of the front hull.
The two side doors were omitted with the right pistol port remaining in place.
Finally, stowage boxes were added to the front and rear and solid road wheels as well as the T49 steel track were introduced.

75mm M3 long calibre gun without, 37mm M6 gun with counterweight