Much on that here:
Is it true that the T-34 was built in the United States during ...
They did borrow their suspension system from the American inventor Christie. It gave them better cross-country speed and the ability to travel better on soggy ground and snow. The Soviets also added sloped armour. See: Christie suspension - Wikipedia The T-34 was better than most German tanks and much better than US tanks. The Soviets manufactured the T-34 is massive numbers. They made over 84,000 of them and simply overwhelmed the Germans. See: T-34 - Wikipedia...It was not until the introduction of Pershings with their thick armor and 90mm M3 gun that the T-34-85s became fun-food for the U.S. - Alan Blair, former Software Architect for a Number of Military System at General Dynamics
HOWEVER, it was thanks to this American gentleman [Albert Kahn] that the Soviet war making industry could produce so many T-34s:...the T-34 was invented and manufactured deep inside the Soviet Motherland but the factories had been built by American architects and engineers, and much of the machinery had been imported from America in the 1930s.- Duc Quyen, World War II fanatic
Ran across an article last week about a family in Belarus who recover and rehabilitate into working condition Soviet and German tanks buried and sunk in the swamps and forests of what was western Russia.
The salvagers who raise WWII Tanks from the dead
‘Titanic tank battles were once fought on what is now Belarus. Now, a dedicated team of salvagers scour marsh and forest to find these forgotten reminders of World War Two.’
http://www.bbc.com/future/story/20180312-the-salvagers-who-raise-world-war-two-tanks-from-the-dead
It’s an enduring shame that the country that practically invented the car, and the assembly line method of mass production sent it’s son’s to war in a tank that was , quite frankly, a piece of crap. I’ve known men who served in armored units in WW2 and they were in awe, and dread of German tanks. And disgusted by the Sherman.