its a 99 5 lug, i ordered downeys coilover kit for it and the guy said i should get the 4x4 springs for the back. the springs give 2in. of lift on the 4x4 and should lift the 2x4 3-4in. because they are stiffer he said. but people are telling me that they are longer than the stock springs and are going to move the the axle back and one guy said that the 4x4 springs are going to lower my truck. im just really confused. i already have 2in. lift shackles i should have just bought a 1.5in. aal for the back, but the dude at downey said that it wasnt good to combine the aal and shackles. someone please help me out here.