Differential flush what to use?

[nanyiru]

Hi, im from Mexico City first of all sorry about my bad english.
im planning to flush my 2nd gen explorer differentials,my question is that in Mexico Motorcraft dont have the friction modifier, if my explorer´s drivers door tag axles code is composed with 2 numbers i need to add the friction modifier? im planning to use Mobil1 85W-140 is that correct?
i cant find any other sinthetic lube here im tryng to get some royal purple but its almost imposible .

Wel i hope you guys can help me!

 

[colintrax]

"flush" isn't the right word, you can flush the transmission but it's really just a fluid change for differentials.

I believe ford calls for 75w-140 in the back and 85w-90 in the front. You might wanna wait for someone to verify that though.
Post the differential tag, if you have a limited slip then the back differential will require friction modifier. The front shouldn't regardless.