I have a 04 f150.w/62000 miles,time to change all fluids.i know the diffs. have syntenic oil . I like to keep things clean,anyway I started with frt/diff. pulled the plate off out comes this milkey gray stuff. unless frd/has a new oil? gears looked ok.changed w/mobil.2qts-next transfer case. took off filler plug to see leval.out comes this stream of oil!! calls for two qts. had to be at least 3! drained an filled ..next r/diff. opened filler plug finger test no oil.had 1 qrt of mobil left.to top of ,well it took 1 an a half qts.no leaks!!but the thing that ! me the trk/was running find....

 

I had the same thing with my transfer case, 1-1 1/2 qts overfilled. Someone said that a seal between trans. and transfer case was leaking but I don't see that as my trans never had to have any fluid added. If there was "cross leaking" then I would have had to add a qt. of ATF to the trans. which I have never had to do. As for the rear end I also had a problem with the low fluid level. Mine turned out to be an axle seal but it didn't show as a leak because it stayed(for a while) in the ebrake drum.

 

My front diff had the same stuff in it. The breather hose is not sealed well. I fixed mine and no more water has come in.

 

You did use ATF in the T-case and not gear lube right?

I ask because you said u had 1 qt left when you got the the rear diff, after the front and T-case

 

ford390gashog how did you fix the breather hose?? thanks/..To ford fx4 yes i did ATF syn/mercon 5

 

Can the front and rear diffs be checked without pulling off the covers? When is the first scheldued maintenance of the diffs according to the manual?

 

according to the manual they dont have to be serviced at all....unless they are submerged in water...i still change mine though...