When lifting a Wrangler JK more then 3 inches it is normal to fit adjustable upper control arms to give correct prop shaft alignment. This typically involves rotating the noise of the rear diff upwards, causing the rear springs to bow.
Now there are 2 options to correct this the first involves cutting the lower spring mounts off the axle and either if possible welding the originals back on at the correct angle or purchasing new mounts. The other option that is a easier method is to fit some wedges, although the first method is a better option the wedges do work well. 
These little wedges are fitted between the spring and lower mount. 
Not perfect but a vast improvement over the original set-up, as an added bonus the rear of the vehicle came up 3/4” due to the fact that the springs were now sitting up straighter.
For more information contact FTE 4x4 Specialists Ltd
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