Lift amount does NOT equal spacer thickness owing to the suspension geometry. Lift spacer is not equal to the actual spacer thickness. -Rear Block is 2" thickness -2004-2020 FORD F150 2WD has NO stock block, it will provide additional 2" lift -2004-2008 FORD F150 4WD has 2" stock block, it will provide NO additional lift -2009-2020 FORD F150 4WD has 1 1/2" stock block, it will provide additional 1/2" lift What is a leveling kit? .