Just a quick update i havnt changed the the gearbox and tranfer oils since and have done roughly 10k. Its been through alot of hard street driving and occasional drags. And in the last 6 months iv been doing a fair bit of 2 step launches with the car making 340awkw. Gearbox hasnt had any issues since and still feels smooth at high and low rpms. Il be servicing soon and will be using the same oils