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If I remember correctly the 80/90 is recommended for the front diff only and the rear takes a 140 weight. The front diff is free rolling most of the time and doesn't work as hard or brake down and heat the fluid like the rear does. I'd certainly not recommend putting that light oil in the rear diff.

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Q: Can you use 80w 90 in both front and rear differentials on my 99 z71?
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