hey, is this a viable option for us 8.25" rear guys?

http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=1158&prmenbr=361

"powertrax locking differential" for 8 1/4" chrysler rears, would it be worth the $410?
is the *** end strong enough to take it if you added a locker?