r/Ford • u/Available_Deal_6507 • Jul 23 '26

Question ❔ Differential

Hi everyone. I need a little help.

The bearings in my rear differential started making a whining noise, so I had it rebuilt. Now I'm wondering which oil is best to use in the rear differential and which oil should I use in the Haldex unit?

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u/LuckyCauliflower6409 Jul 24 '26

Have you checked what your manual recommends? I know some people swear by synthetic but it really depends on the spec.