Ok so my differential was leaking, so I decided to reseal it and change the gear oil as long as I was going in there. I unbolted it, cleaned it up real nice, and used some of that..... i think its called permatex (black, they said it was what the Ford dealerships used). It seal up nice and clean. My problem came when filling it. I started to fill it up using the fill hole until the level of the gear oil reached the fill hole (I saw that some of the gear oil started to flow out) but I had only put 2 quarts when this happened (I read somewhere that the diff take 2.5 quarts). Now I know that when I change the gear oil in a manual tranny you're supposed to fill it up to the fill hole, but I'm not too sure thats the case with differentials. Any advice would be greatly appreciated.

 

Fill to the bottom of the hole.Also do you have a limited slip diff?

 

yes you fill it up to the hole..if you have a limited slip diff you need to get you 6oz of friction modifier from ford

 

2.5 qts? you have the 8.8? its 2 or under i believe

or instead of the traction modifier you can just use Lucas gear oil.

 

Ok that sounds good, i have around 2.
I dont think i have it but how would i know if i have a limited slip?

I was just wondering because I hear a humming sound from back there but i dont know if its normal or not...it probably normal.

 

Get the axle code from the door jam sticker.