I queried Red Line technical support on the proper lubs for my 2K Dak 4x4, 4.7, LSD 5 speed. They recommended 75W-90 (with friction modifier) for the front and rear differential, MTL for the manual transmission and either D4ATF or C+ATF for the tranfer case. I have already done the rear differential using the 75W-90 and I did not add any additional friction modifier and it appears fine without it.
Ron
Springfield, VA
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