The 4" Rancho I have on my truck was an easy 4" with hardly any t-bar cranking ... one of the reasons it rides car-like. The shop where I had it installed said I could get close to 6" if I wanted to crank the t-bars more ... but then would have to add more height in rear to keep truck level. I am VERY satisfied with the Rancho lift and the smooth, car-like ride.