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Hello guys and gals, I want to change the rear diff fluid in my 95 Lightning. What brand and or type should I use? Synthetic or Dino, it is a posi-type, do I need an additive with the synthetic fluid? I am getting conflicting reports and want some input before doing the deed. Thanks Dwayne
 

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Don't assume that just because it's synthetic that it will have the friction modifier added. That said, I'm running Royal Purple full synthetic gear oil which does have the additive. I would think that it would work well in your Lightning.
 

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Royal Purple was one of the brands I was considering, sounds like it will be the one. Thanks Patrick! Dwayne R.
 
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