There is only a 4quart change in the trans if you only drain/drop the pan. A fluid exchange at a lube place or dealer will get all 9 quarts. I got about 4 back in there too. The bottom most bolt on the front diff is the drain. IIRC it may be clogged with gasket sealant. If nothing comes out at first, stick a long screw driver in the hole to get it going. The rear dif drain hole is on the side and both front and rear have fill holes. Speaking from experience...make sure you can get the fill plugs loose first before you drain the oil.

*edit* it took me all day too. I'm sure it will go faster my next time around.