I installed a 4" spring 4" rear block lift and now I have a viibration problem. I cant tell if its from the front or rear, any ideas of what it could be? I can start to feel it at about 15 mph so I dont think it is the new tires/wheels being balanced wrong. I did adjust the thing (forget what its called) that connects to the steering arm so I could get it to turn right again though. The steering arm will be replaced with a drop arm this weekend.