What is durability of the 3sp Savage transmission like?

I will be running a 10xl on 22.2v in my emaxx/savage hybrid (maxx with sav transmission). This is the three speed I am running with mostley metal gears. I was wondering for you experienced users if you know how the transmission will hold up.

I also plan to upgrade my powertrain in the future to a true HV system (40+ volts). Will the 3sp trans hold up?

Thanx