My KJ has an OME spring lift with Bilsteins and rides beautifully. But the rear is strangely about 1 1/2" higher than than the front. I suspect I'm getting some pinion-angle vibrations, due to the new rear drive shaft angle. I've added and maxed a JBA link (with little improvement) and using accelerometer data, I've been able to pinpoint the vibration to the rear shaft, which is 100% new (U-joints also) and precisely balanced. At 47MPH the 245/70/R16 tires make about 9 revolutions per second, with a 3.73 Axle ratio the shaft turns almost 34 times/second. My plot shows 34 peaks per second! Adding/clocking weights to the shaft has little effect. So narrowing in on pinion-angle vibrations. There are several unattractive ways to lower the rear end 1 1/2" and reduce the shaft angle: 1. Add 475 lbs of sand bags to the rear 2. Buy and replace the rear springs with shorter stock springs 3. Buy some kind of "spring compressors" to permanently install 4. Cut the springs shorter 5. Add a clevis lift to the front (It's already hard to climb into). 5. Heat the springs to red-hot and compress 6. Complain to the place that installed the springs that they made the Jeep vibrate 7. Buy a large Boat and tow it everywhere, just to reduce vibrations Anyone have any good ideas or experienced this before? Thanks in advance.