I would really like to know how you could effectively siphon out the old oil???

OP remove the cover bolts and remove the cover, clean out the housing and gears with brake cleaner, scrape off old gasket, reapply black silicon, replace cover, and fill from previously mentioned fill hole.

As far as fluid I recommend Royal Purple 75w140, there is no need to add friction modifier, and my 03 took 3 bottles for what its worth.

 

That's the fluid I'm looking at. Did it take just UNDER three bottles? I want to make sure I order enough...

 

Yeah just under 3 bottles(spilled a little) it is a massive pain in the azz to get the bottle above the diff to completely empty the bottle. I kinda wedged the bottle between the driveshaft and floor pan with a hose on the end into the fill plug.

You should be able to get that Royal Purple at most parts stores, I know O'reilly's for sure carries RP. Be prepared it does not come cheap.

 

Thanks. I know it's expensive lol. What did you mean by reapply black silicon?

 

Black Silicon is the gasket sealant...hey man are you really doing it yourself or are you gathering information?

 

To siphon it out you can use a hand pump.
Also same to fill it.

Something like this.

 

This is the "jiffy-lube" approach--at best you'll get 75% of the old fluid out, and 0.0% of the sludge and "normal wear" metal particles.

To do it properly you need to pull the cover and clean things out as Jay-rod described. That's why Ford did not provide a drain plug, a nice BIG drain and cleaning is what is needed...

 

Hey where do I get a new gasket for the rear end once I seal back up the differential?

 

autozone

 

My diff cover was leaking and I used this write up that was really helpful. It helped me a bunch, Maybe it will help you.

http://www.bullittarchive.com/1005.htm