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I am going to install a set of Poison Spyder Bombshell diff covers this weekend. My question is what gear oil to use. I went to Napa auto parts and they gave me 80W-90 for the front and 75w-140 for the rear and two 4oz tubes of Equa Torque Friction Modifier one for each axel. Both axels are Dana 44 with factory lockers. Why the different oil types for the front and rear. I have a 2012 JK Unlimited Rubicon and it does have traction control if that matters.

I just want to make sure that I have the correct gear oil and if some one knows how much oil I put in both the front and rear axel that would be great.
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