Axis Civil War?

Ok, let's say Germany defeated the Soviet Union in 1942 and then England in 1943/44. And let's say Japan would have totally destroyed/paralyzed the pacific fleet for 6 to 8 months allowing them to take nearly all of the pacific. If this would have happened, the Axis (theorectically) would have conquered the world (half German half Japanese). Do you think the two would have gone to war with each other? Personally if the two powers would have conquered the world I think they would have gone to war with each other. Maybe not immeditally but I think it would have happened...
What do you think? Y/N