Lockers
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If you're sure you want actual locking diffs and not limited slips, you can put in Powertrax Lock Rights, about $300 each and they go in the stock open carriers. Check out www.powertrax.com. I have one in the rear axle of my F350 and like it alot. A buddy of mine has them in both axles of his Jeep CJ and they work good. Trac Tech also makes the Detroit Locker and EZ Locker too. Check them out at www.tractech.com. The Detroits are full-case and more expensive than the Lock Right. EZ Locker goes in the stock case and is priced close to the Lock Right.