If I upgraded my 14/5x springs to say 18/59, how much will that stiffen up the ride/ bump absorption?

 

Higher springs will raise you up a little and the shocks you put on will give you your stiffness or the ride quality that you are looking for. 18/60 springs gave my jk a 2.25 inches height and I put Rubi shocks on and it rides good for now bit will change to a better handling shock later.

 

I went from 14/56 to 18/59 and gained about 1.25" overall. Ride was slightly more firm than with stock Sport shocks. Add rubicon shocks to that and it rode like a 80's 3/4 ton.

I ended up going to the Teraflex performance leveling kit and rubicon shocks. Gained about 1.5" lift from stock and the ride is much more plush. Teraflex springs are very nice.

 

Mine rides much better now, smoother. I went up the same numbers, with the Rubi shocks. I also have a heavy bumper and winch as well as a heavy skid plate. I gained about 1.25" with the bumper/winch. I would have went up over 2" easy with no bumper combo. Pics are before and after.

 

I was thinking it would be a rougher ride. Good tip on Teraflex kit. I'm going to look it up