The only time aftermarket is any better then OEM is if you step up to a better quality bearing such as a double rolling bearing carrier or those low friction magnesium bearings that have cylinders instead of balls.

 

The quad boss set had cylinders instead of balls?

 

Suntiet: It's best if it has some balls!

 

That's the info I picked up from looking around on the net, aftermarket bearings seam to work the same as OEM, and they are cheaper but OEM seams to out last them. What about ball joints and tie rod ends? Are the aftermarket parts beefier? Stronger? I am planning on redoing the front end next, disc brake conversion and a 2 to 4 wheel drive adapter. Maybe a detroit gearless locker, but i haven't decided, the factory system has never let me down. I was going to put the 2-4 conversion on just to save wear and tear.