Just raise back up and your problem is solved haha.I got 4" blocks and i got a slight groan at speeds over 80 mph but you have to have something alot more going on under there.Check your blocks first is what should be the first thing and make sure you got the fat pins all ligned up on the blocks to the spring plate and it is all sitting flush,second i would check to make sure you also tightened it up all well to.Some times we get in a hurry and we miss things,so in my opinion if it did not do it before start with what you did first and work your way out from there.