I bought the Readylift 69-8020 kit off Amazon. There was only one review, and it was negative. But there are ALWAYS going to be some negative reviews. I had the tire shop (Big O) install the lift kit and tires. One stop shopping. It turned out to be a cluster $%&@ , it's relevant, but I'll save that story for later. Bottom line: they put new axles in it, because of this vibration problem. I picked it up last night and I have a distinct vibration on acceleration, which was the Amazon reviewer's post. I'll do a screen shot of it. It looks great and I have great clearance and it's going to give me a lot more utility now and the tires look and ride awesome (31" BFG KO 2's).