Where are you (or the rear)? And I'd guess that there is a reason it's $100. But a core is a core. There is ALOOOOOT of discussion on this forum about rear ends (ones with gears lol). Finding something useable for $100 and mix in another $6-800 and you might have something. If your fabrication and gear skill are nil, then you might want to pass. If not, then sounds like a road trip.
p.s. - If it's near me I won't go grab from under you - no FoMoCo products in our G-Body
p.s. - If it's near me I won't go grab from under you - no FoMoCo products in our G-Body