Imagine German ingenuity and organizational skills becoming part of the Soviet war machine.
The first hurdle would be jetting Upper class German generals to submit with people they really, really hate. They wouldn't be inclined to permit a significant number of Soviet troops into Western Europe, nor did they need them in the East. IN fact, they agreed with Hitler and the Nazis that the Soviet Union should be conquered once convenient. There would be no more cooperation in their nuclear programs than there was between Germany and Japan* - and they liked each other.
While the USSR might, after some years of work, build their shipbuilding industry to the point where it could threaten the UK, it could not out-build both Britain and the United States or even the United States on its own.
Remember, the US would still fight the war in the Pacific,
That's certainly not certain given the massive change a German-Soviet alliance would make in international affairs. At any rate, the US was quite aware that while Japan was a serious nuisance, Germany and the USSR represented existential threats. Like in real life, the most likely American strategy would be Europe-First.
*Japan was actually closer to developing a nuclear weapon than Germany. At least they had the theory right. Of course, by the time they might have got one, the Soviets and Americans would have had them for years.
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