Rear diff service

mjonesjr

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If you put synthetic fluid in the diff you will NOT have to add the friction modifier as all synthetic gear oil already has the friction additive in it.
 

mjonesjr

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ummmmm..... are you sure about that.... i have amsoil and it requires it!!
Then Amsoil is the only synthetic gear oil that I have ever saw that required it. I bet if you look on the bottle it will show it includes the friction modifier.

Another reason not to use Amsoil (sorry, not a fan).
 

lincolnlocker

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it may be added to most but so far i have never heard of anyone NOT adding it if needed.... why take a chance.... especially if your towing heavy and the clutches lock up and you snap a axle shaft turning a corner...
 

Diesel_Brad

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If you put synthetic fluid in the diff you will NOT have to add the friction modifier as all synthetic gear oil already has the friction additive in it.

That is a load of crap. I dont know where you heard that from. Says right in the FORD service manual to put in the friction modifier then fill with synthetic fluid
 

Tom S

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I actually would not go full boar on added friction modifyer will sythetic. Maybe start out with half or something
 

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