fluids

[Kent Holliston 2]

I am going to change front and rear diffs and transfer case fluids



I would like to put all synthetic in



any suggestions for brands and weights?

 

[Mark K 2]

IIRC, the differential fluid is already synthetic.

 

[Robert Caffyn]

Follow the manufacturers recommendations and use Ford lubricants(already synthetic) or any of the more expensive brands that are essentially the same(Mobil1, Royal Purple, Castrol, Pennzoil, Lucas, etc). Please check to see if you have a posi differential as it may require a friction modifier(from Ford) so the clutch packs work properly. Bob