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I was wondering what kind, weight gear oil to use? I have a 2002 tj Sahara with Dana 35 with 3.73's in the rear and a 30 up front. I'm gonna go synthetic fluids all around if I can afford it. After all this then I will save up for bolt on goodies
 

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Just use a conventional 75w90 or 140 oil. You don't need synthetic gear oil in your diffs. Waisted money.
 
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