There were three compartments, the driver's, fighting area, and the engine.
The driver sat on the left with the hull gunner / radio operator on the right. The seats were padded with arms and the back rests folded but they weren't adjustable.
The driver had his clutch pedal on the left, the foot brake in the center, and the accelerator on the right. The steering levers were on each side with the gear changing lever to the right. There were two vertically mounted episcopes in the access hatch. The optic glass was rather poor so visibility was poor when the door was closed.
The hull gunner's machine gun was mounted on an armored hood with an internal ball. To the left of the seats were ammunition drums containing the ammunition for the machine gun. The company commander's tank contained radio equipment that was located to the right of the gunner in a pannier. In the floor in front of the hull gunner was an escape hatch.
The commander/gunner sat on the left in the turret and the loader on the right with the breech between them. The seats had backrests and could be adjusted. There was a steel tube that went around the breech that had a canvas bag to catch the shells.
The commander had a periscope in front of him to site the gun and a hand wheel to the left to traverse the turret. Unfortunately this forces many commanders to reach across their bodies with their right hands to operate it. There was a power traverse control on top of the motor casing on the gunner's left. There was a hand wheel that controlled the elevation of the gun to the right of the commander.
The new turret for the T-34/76 Model 1942 weighed 4.32 tons. Its ring diameter was 4.6' / 1.38 m. The turret was cast hexagonal in shape and could hold two crew members. There were some rolled plates in the roof of the turret.
At the rear of the turret was an armored plate that had a set of screws holding it in place. Some feel that it was intended to carry a machine gun in the rear of the turret but they were never installed or it may have been used to install the main gun.
In the room was a large hatch that opened towards the front. When the hatch was open it not only exposed much of the interior of the T-34 but it forced the commander to peer around it to see.
There were two episcopes in the side walls of the turret, one for the commander and the other for the loader. Below these were pistol ports. It was closed by a steel plug that had to have a hard blow to open. There was another pistol port in the rear wall of the turret, but typically, machine gun magazines blocked its use.
A few models had a small hatch above the loader to be used for a signal flag.
Most of the ports were not installed in later versions of the turret to simplify production.
The seats were secured to the turret ring and rotated with the turret.
The gun's breech mechanism was either hand or semi-automatically operated.
There were four cast iron blocks (~168 lbs.) that were on the underside of the cradle to reduce muzzle heaviness, however, crews still reported muzzle heaviness when in use.
The 76.2 mm gun could be fired by foot or by hand.
The 7.62 mm MG was designed by V. A. Degtyarev in the 1930s. The machine gun was gas operated and had a drum type magazine that could hold 63 rounds. The DT MG could fire about 600 rounds a minute at a sighted range of 1,000 m. The machine gun could be removed from the tank and used as there was a bipod included in storage.
The suspension was derived from the original Christie design with the wheels independently sprung. The tracks had guide horns which ran between the pairs of wheels and this made it so no return rollers were needed.
On the leading wheels there were two coil springs and these were housed inside the hull plates.
The track pins were rounded on the inside facing side. This allowed for no retention device being need to keep them in place as there was a plate at the rear hull of the tank that when the pins started to work their way out, they would hit against the plate and be driven back in.
There were two towing / lifting hooks welded to the front plate. There were two towing eyes near the bottom of the rear hull. There were usually two towing cables attached to the hull.
Some models had a commander's cupola added. A few had welded turrets. There were also improvements in the range, air filters, transmission, and in the techniques to produce them.