T34, the American premium flagship, quite formidable for the medium tiers, but as with most premium tanks you often get quite a nice target, as they seem to drive more recklessly.
The front, although strong, has quite a large spot of weak armor right below the gun with the right side quite penetrable at the driver position.
The sides are what you should go for, with the ammo rack being in the top front of the track and the engines in the back. It also has a funny weakspot right on the Army logo.
The back offers a big engine section between the tracks, and a large spot of weak armor in the back of the turret.
The ammo rack is located on the top of the back part the front half of the track on both sides.