Aftermarket IFS versus subframe? I went with the aftermarket version,TCI,and if I ever do another one I will go the same way.Subframe is Ok,but when you figure in rebuilding the unit you are putting in,there aint a heck of a lot of difference money wise.If you are planning on modifying your truck,you will soon find out it is an expensive proposition.But then when you finally get it up and running,you will feel it was all worth it.