With the straight T-700 401C or 701C providing about 2000 HP
(as I read the GE brochure, that's 1900+ at contingency power, 1800+ for 30 minutes)
a boost to 2600 HP would potentially work the transmission harder.
With a boost to 3000 HP in the 901 - yes, I think you'd want a beefier transmission.
(And maybe you'd need to refigure the loads on the hub)