front rear or posi lock?

[sevenslats]

Darrick had a thread on this very recently.

I'd put the $$ toward a rear axle upgrade. And then lock that.

I have 1 locker right now, and it's in the front. While it does help a little on flat ground, it's useless on hill climbs. There's just not enough weight up there for the benefits of the locker to come into play.
Oh, and if you do lock the front, do the posi-lock as well. I believe the Whitlock Version 3 is ready for production.