2. The AxleTech design uses a portal box and a separate knuckle or adapter at each corner. The same box can be adapted to a variety of different axles. The stock Chevy Dana 60 kingpin knuckle is on the left, and the AxleTech International Motorsports (AIM) knuckle that we replaced it with is on the right. Everything from the inner "C" outward is replaced with AxleTech parts; all you re-use is the inner shaft and the U-joints, upper and lower kingpin components, and the top plates and/or steering arms.