I am not sure one can accurately predict a conventional war between the western allies and the USSR in 1945. The soviets, despite their seemingly enormous amounts of men and material, would have been at a considerable disadvantage if the war had gone on for quite some time.
1.) As incredible as it sounds the Red Army was running out of men at the end. The losses it suffered were horrendous and while they still had tanks, artillery and aircraft by the thousands they had trouble replacing their infantry losses. If the war had turned into a war of attrition they would have faced even more serious manpower shortages.
2.) The soviet war economy was totally focused on building tanks, artillery and combat aircraft - their entire logistical system was depending on allied deliveries. Soviet truck building was inadequate even before the war and once it got underway the production was little more than a trickle to douse a forest fire. It was not before some serious shipments of US-made trucks arrived that the Red Army got any kind of strategic mobility. So initially they had enormous strategic mobility but after a while, with losses due to accidents, wear&tear and enemy action growing, they would become less and less able to stage far-ranging offensives.
3.) Fuel was the other major achilles heel of the Red Army. It was dependent on oil coming from the Caucasian fields and the Allies had airfields within striking distance. A crippling blow to soviet oil production was theoretically possible ... and it would have been just as effective as the attacks against the german synthetic fuel works in 1944.
On the other hand the Red Army had a considerable numerical superiority over the allied ground forces - at least initially - and combined with the fact that allied ground forces just weren't used to considerable losses and an enemy on par with them the Red Army may very well have given them a beating.
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