That depends. Alignment specs are a range. Changing the suspension will alter the alignment. Depending on where it was prior to the change, it may or may not still be in an acceptable range. I set my ICON at 1.75 and did need an alignment, but it was only slightly out of spec. I did the lifetime alignment at a local shop I use and for $100 they will align it 3 times a year for as long as I own the truck. Well worth it if you plan to take the truck off road. If you push it hard off road, the alignment can get knocked out pretty easy.I have the ICON kit. Do you need an alignment after 1.5" perch?