I know this is all a tad strange, but bear with me.
Imagine a world where a successful 'Valkyrie' was carried out in 1943, the Nazis were all removed from power, and after a few years *Germany joins a NATO-analogue to oppose the Soviets, who have grabbed all of Eastern Europe. This means that there isn't much in the way of a halt in military activity and development; perhaps a few years as part of treaties and economic restructuring. Yes, I know this is all quite unlikely, but in the context of this TL I'm working on it's a bit more believable.
How would their tanks develop? Would the *Germans simply buy American tanks, or upgrade or build their own ones? Would they still use their own 8.8 CM KwK 43 guns and the like?
Any ideas would be appreciated.