ironman4x4

I just installed the Ironman HD leaf springs, both sides new shackles, bushings, u-bolts. it’s lifted my rear end up a lot. now, it has a vibration to it, and it sounds like a tractor going down the road at 25-35 mph. What could this be? never had any of these issues prior

Hi all! New to to the forum (2012 Xterra S). I've done some good research on all three of these kits (Bilstein 5100s with Broverland leaf pack, Dobinsons lift kit via Z1offroad and the Ironman4x4 nitro gas Stage 1 2in lift) but have not found much comparing between them so I'm hoping to get some...