ive been looking around at the people who sell these and they are pretty pricey? are they worth it? i will probably have 4.5-5.5 inches of lift with coils all the way around and probably be running 38s. do i need a custom knuckle? can i use a chevy one? it is on a D44 til i get some cash together to build a D60. are the D44 and D60 arm interchangable? who is the best place to go? well thanks a lot