Have any of you that have put on the taller springs checked how off center the axle is? You are pushing the front up 2 1/2" with a non-adjustable front trackbar. Not only is there an increase vertical angle on the front driveshaft because of the longer springs, the front diff has shifted towards the driver side (US LHD) a bit. The axle has likely shifted 1/4" to 1/2" which isn't a lot but when you put both of these deviations on the CV joints in the driveshaft it increases chance of failure. Rear at only 1 1/2" lift probably isn't as much of a concern but I would think not only do you need a front driveshaft you probably also need an adjustable front track bar or at least a track bar bracket that will recenter the front axle.