It was about 10 inches. Some guys move the axle back an inch or so, I just left mine in the original position.
Agreed I left mine in the stock location. Mount the springs in the perch and mark where they meet the frame. Work off of there.
You should just have to buy the ruff stuff kit and everything is included. Although mine was missing a couple of 9/16x 5" shackle bolts so make sure you have enough of those. A little welding and half a day or so should do it.
