ya', the spacers change the preload of the springs, and if there is any sag in the spring, then it WILL lift it to the point of the max shock extension..
So say, if you got 1 inch of slack in your springs, then typically you will get that one inch back...
Depending on the shock, and the springs, it may or may not be a bumpy ride..
It helped the rears on mine with the spacer, it is not by any means bumpy.....
They are a good upgrade for those that dont want abracket lift, or that there isnt one available for it...
The outty, it has a bracket lift on front, but on the rear you cant put bracket on with out having axle troubles.... So the spacer works great..... It will also sit down in the Azz less while riding which when it sits down, you lose clearance.. Same principle with carrying a passenger......
LOL sorry for the long winded.. And didnt mean to hi jack either...