It has been said for a time now, as a general rule of thumb, the T50 gearbox or T series diff will take about 200hp. Which is about 150kw. Which is about 100rwkw.
But they can take a fair bit more than that. It all depends on driving style. The T series diff can last a long time, even with turbo. Mostly it depends if the center is locked or not, and how you drive. Many turbo owners use the T series for a fair while, but then go to a HiLux diff.