Ok, so I am going to be changing all my fluids over to fully synthetic, already did my rear diff.

So now I need to change my transfer case fluids, transmission fluids, front differential, and what else?

What other fluids can I cahnge to fully synth. that'll actually make a difference?

Also, how much will changing over the tranny, transfer case, and front diff. change my gas mileage? Will it make it better? Even if I gain like .5 - 1mpg, it'll pay for itself in like one tank of gas.

Thanks..... :-)