I have a 2004 chevy silverado 1500 2wd with a 3inch suspension lift.i just got 3inch spacers for the front to level it out. when the spacers came in I noticed the thickness of the spacers are only about an inch to an inch and a half. the instructions say exactly..when spacers are installed on the front on SLA suspensions, vehicle height is raised approximately 2.5 to 3 times the thickness of the spacer..how is this possible?