Hello, I want to change the oils in my tranny,rear,and front diff's. I am currently using Amsoil 5/30 Syn in the engine. I read that there is a special oil, ie GL/4 GL/5 that has to be used. This is very confusing to me. Would you happen to know which Amsoil I would need for the different oils that I want to change?.I would like to stick with the Amsoil brand. 04 X 5spd, XE Championship package, sport package.

Thanks in advance

Dave