Okay, I'll admit I'm not a mechanic. However, I have to say that the instructions are really useless. There are three pictures in the position listing to show which part is in which position on the jeep frame, but there are no pictures of each part with the corresponding part number. All three pictures are exactly the same and do not show the correct shape of each bushing. Working alone, the installation took 5 hours mainly due to poor instructions, plus I had LOTS of extra parts that didn't fit anywhere in my jeep. Yes I checked with a mechanic and I have a full lift kit on my car. You need the optional steel bushing, which you will receive when ordering. The end result was excellent. The ride has been greatly improved, much smoother. Clear and understandable instructions with good pictures would make the installation quite easy, that's the difference between 3 and 5 stars. It later turned out that the extra parts were for CJ.