Does this rear make me look fat?

Nope, no pictures!
I'd like to know where to find a limited slip (posi for you GM indocrinated types) rear for my first gen.
I've hears something about Monteros having them, is that so, and are they std equip so that all of them have them?
Do 4X4's all have them?
Anyone know of aftermarket sources?
I was, and still may have to, put a narrowed Mopar 8.25 rear in the truck, but the specs on the stock rear tell me it is very stout. I just need a limited slip then, and have new axles drilled for a 5 X 4.5 pattern and I'm home free. (Well, almost free)
Thanks in advance...

ya i think i remember seeing where some one put the montero lsd into a d50 axle. ill try and find it for you.

heres a little bit of info.

Wow, now that's some seriously helpful info; thanks!

ya theres lots of good info on that site.