Well, we would have prevailed.
They would then be fighting a united coalition of many countries and an insurgency of those people’s countries they took over.
I think the US, France & Britain would have withdrawn across the Rhine & Danube Rivers and sought mountainous & wooded terrain to defend. Use tactial airpower to knock out their rail lines (all Soviet locomotives were US-built allowing the Russians to focus on tank production)
Once the rail traffic stops & the US-built Dodge trucks get attrited, the Russians walk home.