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Changing Differential fluid


Chrisman889

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1993 Ford Explorer xlt
I recently changed my differential fluid in my 93 explorer. I used sae 40w90. Later I read in the Haynes guide that I should use 75w 140, how will this affect my drive ability? I was also reading I may need to add some kind of anti slip fluid. Is this true?
 


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JohnnyO

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Too thin, you should change it and put in the proper viscosity. You only need limited-slip additive if your rear axle has a limited-slip differential.
 




Chrisman889

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That's what I was afraid of. There seems to be more humming and vibration. I checked the door codes and it is D4 which I think is Limited slip 3:73. How about that Lucas synthetic, I read some comments on Amazon that it has the additive already in. What would be the best fluid and additive to use? Thanks
 




IZwack

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Pretty much all synthetic gear oils do not need the additive (aka "friction modifier") as they already have it. As for me, I go with Mobil-1 or Redline.
 




Chrisman889

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Thanks for the info. I would guess it takes about 2-3 quarts?
 




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