When FDR extracted an undertaking from JS to enter the war after VE day, JS got 500 brand new diesel M4s for the FEMD. He also got a fleet of landing craft, that were handed over at Cold Bay (hush hush at the time).
The Soviets had built up depots of tanks etc, in the transbaikal/far east before they moved the troops - eg 6th Guards tank army personnel was rail lifted from Hungary, but left their old tanks behind, and were issued the new ones that had been pre-positioned.
Whether these M4s were the 76mm version, or 75mm armed, I'm not sure. But if they were the 76mm ones, then at least the Soviet crews were able to get the stabilzers to work
"You may find that having is not so nearly pleasing a thing as wanting. It is not logical, but it is often true."
- Cdr Spock