Actually if you want to "stiffen" the diff's then check out Maxima Blue grease. It does not get thrown off of the gears as it's consistency is extremely tacky. I use it in my MT diffs as well as my 5B SS, and Rampage MT. Unlike other greases when that get flung off the Maxima is so sticky and "stringy" that it actually gets pulled back onto the grears as they rotate. I can stick my finger on the surface of the Maxima and actually pull 2 inch "strings" from the tub. I heard that the Kendall Blue is the same but can't find it anywhere local.