I have evo 8 making 700hp fully built with transmission wanted to know what fluids would you guys recommend for this build?

 

Redline MTL 85 or a mix of MTL 80 & 90. Do not use GL5, only GL4 or GL4/5 that says it is save for brass to protect synchro's.. Oil will not save gears. So run something good that will not stop you from shifting and has decent lube properties. Straight cut gears are stronger than helical cut. But at some point you will make more power than gears can take, good oil might stop wear but won't stop teeth from snapping off.