Used kit in a YJ spring conversion for a C101 Jeepster Commando.
Excellent lift kit, especially for the price. Great flex, and for me, a smooth ride.
As with any leaf spring, you need to ensure the correct shackle angle when you install.
You *may* need to increase length of the shackle slightly to ensure a 90 degree incidence between shackle and spring datum line (line drawn straight between both spring eyes when on vehicle). If angle less than 90 degrees, your ride will be stiff. If more than 90 degrees, spring rate will be soft. Look at quadratec website for a brief prier on leaf spring basics.
Lift initially will be about 3" over stock, new, springs. Could be more than that depending on how flat your springs were. Springs will settle about 1/2" after a few hundred miles.
You may need to drop TC and get longer brake lines.
With increased flex and height, you may get an initial "tippy" feeling on road. Make sure you adjust or replace your swaybar links with the correctly sized links. I experienced "tippyness" for about 250 miles and then it settled down a bit.
I bought an older kit, at a discount, with Heckethorn Hydro 8000 shocks from one of the online warehouses and rubber bushings in a steel sleeve already in the leafs. I pressed the stock bushings out and went with urethane bushings and greasable shackle bolts. Your choice - but rubber provides an initially softer ride than urethane and is fine for most applications. I am a personal fan of Heckethorn monotube shocks. been running hydros and nitros for years, and I like their beefyness and ride.
Strongly recommend their 2.5" lift kit, ESPECIALLY if you are doing a CJ to YJ spring conversion.