Okay, I've done a search for the fluids I need for my 99 400 4x4, but still need to clarify. I'm going to use Mobil-1 syn ATF in the front hubs and Polaris's 2 cycle oil. Can I use a synthetic 75 or 80-90 gear lube in the front differential? What other fluids could I possibly change? I think this machine may have a counter balancer with oil. Can I just use synthetic 0w-40 or 10w-30 in that? Any other fluids I need to change? Thanks