supreamS14 wrote:2.5 for transmission +1.5 for diff. = 4 gear oil bottles. Use the good stuff! Only use GL-4 75-90 for the transmission. Or royal purple makes a GL-5 that won't eat our brass synchronizes.
75-90 unless you are racing then you will need to go higher on the weight. But get Good stuff, Redline, Mobil 1, Royal Purple, etc. I am also a fan of using zmax on every third oil change. That is my preference that i developed after I saw it do wonders in cleaning out old deposits in the head.
I use Royal Purple, all the way around.