If you've kept tabs on our '04 4Runner build, you know we've been using an automatic locker in our Currie 9-inch rearend. The automatic locker has done everything we've asked: It's been self-contained ...

Broadly speaking, differentials can be categorized into open, locking, and limited-slip, and each of those types of differentials can be mechanical or electronic. In its most basic format, an open ...

When it comes to lockers, limited slips, spools, and every iteration of traction differential in between, we've literally driven them all. And that includes the old-school stuff that isn't ...