i have alot of questions about shackle flips.. how do they work? can you lift the rear and the front with them? is it a reliable lift for a DD? how much can you get out of them. i wanted a 6" lift. and i thought this may be a cheaper route to take. and how much are they usually? who makes them? i have a 76 blazer. if any other info about the truck is needed just tell me. thanks.