i think about 3" max. usually if people do a 3"+ lift, the use longer shocks up back for more travel, and this is where the ball joint starts to bind. you should be right with less than 3" lift, but you can make one to suit the lift you have. ie:, if you have 2", make a 2" one, and if you have 4", make a 4" one. or soemthing along the lines of that.