New gears/ what fluid?

So I got my truck re geared with 4.56 gears from ECGS. After my 500 mile break in I want to change all the fluids. Was wondering if I go with the regular 75W90 gear oil or if I go different spec oil since the gears are different?

 

I would think 75w90 would be fine. you could call the gear manufacturer to confirm but I think it wont matter what you put in, even if its a strait viscosity anywhere between 75 and 90

 

Fill with a quality 75w90 synthetic and don't look back. Changing gear ratio makes no difference in required lubricant. Ambient temperature is more of a factor, but 75w90 will cover you just fine.

 

Chase @ ECGS specifically recommends Lucas Dino fliuds... call him. After spending that much money and getting a warrantied product go with what the company selling you the parts recommends using after all they are the pro's....