They will allow one side at a time to drop down further and gain better articulation, but be wary of pinion angles and brake lines. Also I suppose that if you high centered on a rock it would at least look and may act like it is lifted in the back
My brother's XJ got about 1.75-2" of added lift to his. They worked well on the trail (with the exception of axle wrap when both sides unloaded at the same time). We had to trianglate (sp?) / \ the rear shocks and lenghten the rear brake line to make them work well. If we built another XJ we would use 63inch chevy's instead.
edit: the jeep sat level when we added 1.75" coil spacers with the revolvers.
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