Yes, I did use the search function, but there seems to be a few different opinions. My truck: S83P, 5 speed, 2 speed transfer case (Hi/Lo) SAE 90/GL5 for the rear SAE 75/85/GL5 for the front SAE 75/85 for the tranny/transfer case (GL3 or Must be copper/bronze/yellow metal safe?) OR 75/90 OR 80/90 OR 80 OR 90 -These were pulled from the Japanese S100 manual (dunno if they are different components), S85 manual What do you use in your tranny and transfer case?