Please provide some POD or premise.
I just posted this in another thread about Japan, but I imagine that if the Japanese Army had won the skirmish of Khalkhin Gol against the Soviets in 1939 (or a number of other skirmishes taking place in the 1930s), I can imagine the Japanese Army's "Strike North" doctrine becoming more influential over the Navy's "Southern Path" doctrine.
In that case I can imagine Japan striking northwards towards resource-rich Siberia in 1941, invading the Soviet Union as part of Operation Barbarossa, and leaving Pearl Harbour alone.
This has two effects: The Soviets would be in a much more difficult situation, facing dual fronts in the East and the West. And the Americans would have a more neutralist stance, delaying their entry into the war for at least a year.
Under such a scenario I can imagine a prolongued war and the Axis reaching a negotiated peace with the Allies some point after 1946-1948, with Nazi Germany probably getting to keep most of Europe under its thumb. (With the exception of Britain and Neutral Spain and Portugal, perhaps France or Southern Italy if the Allies manage to push into there)
Under such a scenario (similar to the Fatherland novel) I can imagine a Cold War developing between a Western Hemisphere led by the United States and the Axis led by Germany, a space race could be considered a logical development from that, with the Nazis probably getting the first satellite and first man on space much like the Soviets did in OTL, but the Americans still getting to the Moon first.
The German economy, even controlling much of Europe, would be in dire straits during this hypothetical Cold War: autarky, state-controlled economic planning, nationalizations, wage controls and command economy were integral to the Nazi ideology since the moment Hitler dismissed Hjalmar Schacht and gave control of the economy to the likes of Göring and Walther Funk.
Short of major reforms or an earlier collapse, Nazi Germany by the 1970s will be looking much like the Soviet Union did, a stagnating command economy with massive breadlines, cash-strapped, and quickly losing ground to the more dynamic United States.