Tire Wear

[truckster]

I realize this one might get moved, but it's a Blazer, so I'll start here.

Here's the setup: 72 Blazer 4wd, 2in body lift, running 33x12.50x15 Pirelli Scorpion tires. Tires were new when I bought it, and I've rotated them regularly. I replaced the ball joints, suspension bushings, tie rod ends, and steering gear. I also rebuilt the hubs and packed the bearings. Everything appears to be tight. The caster and camber aren't adjustable as far as I can tell, and toe-in is 1/8 inch.

The problem: My front tires wear on the outsides. The problem is pronounced enough that the outsides of my tires are bald and I have at least 3/8 inch tread on the insides. I'm not sure what might be causing it. Any ideas?