I use Mobil 1 in my rear diff only because of the ARB. Before that, I used the cheapie Coastal or other store brand (which is what I still use in the front). IMHO, its not worth dropping any extra coin on a stock diff. The 'average' vehicle owner probably never even changes diff fluid and how many people do you know that have had R&P failure?

Sean Strawmyer
Back and ready to rock...... crawl.

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