What Diff Oil To Use?
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Here is thought for you. You make your own conclusion. 50K miles on Amsoil 75/90 gear lube. Check it at 100K miles. 3:73 rear ratio. I replace the old with new, guess what I use QTip to check the used lube vs the brand new on a very clean white paper towel. I could hardly see the difference. I'm impressed. Use only qualitative lubricants in your truck on everything and you won't be sorry. Lubricants are cheap, repair bill are high.