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If you look at a swaybar, it connects each end of the axle together in relation to the chassis.
So when one wheel goes up, the swaybar trys to lift the opposite wheel up, likewise when one goes down, it tries to push the opposite wheel down. So if you disconnect one side, it can no longer act upon the opposite side.
The factory disconnect is basically a long rod connected to the chassis at the top and the swaybar at the bottom. In the middle of this rod is a machined groove which a set of spring loaded jaws (in the disconnect mechanism) lock into when the sway bar is in use. Pull the lever and the jaws disconnect from the groove and the rod can slide up and down.
The issue with the factory disconnect is that the amount the disconnected side can move without acting upon the diff is limited by the length of this rod. So getting not only an extended link, but one that is taller as well (think about is as extendeding it on either side of the locking groove), will allow it to travel up/down more before it hits the stops on the disconnect and starts acting on the diff.
Sorry of that does not explain it too well..cant work out exactly how to put it into words.
Last edited by doka404; 11th April 2015 at 08:44 PM.