Just had those installed along with some shackles about a week ago and they squeek like a wornout hotel spring mattres. I hate it and so does my wife. After a cloer look I found the noise is not coming from the leafspring/shackle bolts but from the leafs rubbing against each other as they have plastic spacers inbetween them. Anybody else have any noise problems with these or what kind of grease will help me get rid of this noise?