Thanks guys. As far as the spool, the only reason I'm running it is that the 4Runner is not my daily! Lol. I've driven welded diff cars before. It's not that bad, but it can get old in certain situations. It's cheap and effective for a rig that will hopefully spend most it's life off road.
Sounds like you're aware that a spool is not the best choice for a road driven rig. Rain, snow, slick mud can all be downright dangerous with a locked rear, not to mention the uneven tire wear.
I used to run a spool in my 510 Datsun on the street, because it was an occasional track car too. It wore out the front tires faster than the rears, from pushing into the turns. But then I didn't care because I got free take-offs from the guys at Skip Barber.