This is a very informative thread, should be archived imo. Any way, one aspect I've seen neglected here is cost, a spool being in the $150 range vs a Detroit locker in the $725 range for a Dana 60. I've been weighing the pros and cons of upgrading my 8.75 vs biting the bullet and going the S60 route. The S60 seems to make sense to me, spend the money once, then never worry about it again. I'm gonna go spool as well, cost effective and extremely reliable. Just my 2 cents.