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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
Use the additive, even if the synthetic you are using says you don't need to. The stock LSD seems to be ok with synthetic's that include it such as Royal Purple, but a lot of people are reporting chatter in the better aftermarket LSD's w/o the additive.