1066162
Hehe, an open diff allows your left and right wheels (on the same axel) to spin independently. When you make a right turn the wheels on the left actually travel a slightly larger distance than the wheels on the right, and the open diff allowes you to do that. You can purchase a locked, or lockable diff that makes both tires spin at the same exact speed, evenly distributing the power over both wheels... I beleive its more commonly used if your jeep is 90%+ for trails and rocks. Chances are you dont have a need for one, but as Bounty said, you have the open diffs. And no, it wouldn't eliminate the need for your vacum lines ;-)[addsig]