Gunnersmate
TJ Enthusiast
Thanks Jerry for that catchYour axles require a gear lube that has a GL-5 rating. The exact viscosity is not important, a 70W-80, 75W-90, 85W-120, etc. is fine. Personally I prefer a conventional gear lube inside our axles (gears run cooler with a conventional gear lube) but for an existing axle a synthetic GL-5 is fine too.