Diff leakage :(

[DRZDuke]

2003 Hummer H2 SUV

I have developed a massive diff fluid leak out of the front diff once the unit gets hot. The pinion area looks to be dry. I think it may be leaking out of the case center at the bottom where the halves join ... is there a seal for this?
Can anyone provide me an exploded view of the front diff. with all the parts and pieces or point me in the right direction.
I'm thinkin' that if I take this unit out and disassemble it, it's going to start costing $$$ and I've been on disability for a few years and can't afford a major repair bill right now so maybe grabbing a used pumkin complete might be the way to go. Also, are all the 2003 H2's diff ratios the same ? Is it a 4:10gear set ?
Any ideas or help in any way would be greatly appreciated.