Question I have a 2008 Nissan Titan 4x4 with a six inch Pro Comp lift and want to change out struts. do I have to buy a whole coil over or can I just use my Factory Spring and just get the billsten 1500 struts. Also after install the back end of the truck is seems lower than the front I've heard of rake, does that mean the back is lower or higher when it has rake?