I was under the impression that the Russians used the M4A2 because that's what we sent them.
Anyway, yes, it was the engine that was the chief difference between different designations. Shermans used a bewildering variety of turrets, suspensions, transmission covers, etc, but an M4A3 always had the Ford engine, an M4/M4A1 always used the the Wright, M4A4 the Chrysler multibank, and so on.
I don't know about the turret. The 76-gunned Shermans had a different turret than the 75mm models, but I don't know if the Russian ones had yet another turret besides that.
QUOTE: Originally posted by Captain Caveman
there are US versions coming out soon
a M4A2 pacific and a M4A3
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But not the M4A1?
M.