diff and trans case
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New User
Joined: May 2010
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diff and trans case
Hi, i want to change the fluid in both diffs and transfer case. i would like to know how much fluid i need and what to put in them. do both diffs take the same thing? i have a 3.55 non-limited slip. also i read that i need to take the back diff apart and put it back together with RTV. Which one do you use? Black ,blue, copper? i will be puting in synthetic so any recommendations on brand ?
Elder User
Joined: Oct 2003
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From: Gilbert, AZ
I had both diffs done at the dealer and they used 75w140 with a bottle of friction modifier in each one. Not sure on the exact amounts but i think it was 3 quarts each. The rear diff is put together with RTV... any RTV would do. The dealer used black but if you bought it on your own im sure the color doesnt matter as long as its RTV. I would get the high temp one too. I would go with genuine ford oil as far as brands...... just my humble opinion 
Hotshot
Joined: Jul 2005
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your not taking the back differential apart, you taking the sheet metal pan off the back as there is no drain plug. you then glue the pan back on (and a dozen bolts) with RTV. The older trucks had 80-90 wt gear lube, non synthetic. THe newer spec is 75w-140... you can use either. You can use generic gear lube from Wal Mart if you want, dont make any difference at all.
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ok, changed out the fluid in the front and back diff and put in full synthetic 75w140 and changed transfer case fluid also. Went for an hour drive and checked everything when i got back. no leaks but the rear diff was so hot i couldnt keep my hand on it. The front diff was warm. is it normal for the rear diff to be so hot ?
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Hotshot
Joined: Jul 2005
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i have seen more than one rear axle with the paint burnt off the cover. Why ?? i dont know, but some do get real hot.
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