About a month ago I tackled the suspension and front sway bar.
The difference between the Atlas 52" springs and stock.
I used an air chisel to remove the rivets.
used a 2" hole saw to make to mount the new rear shackle which moved back about 4-5".
I believe the new shackle mount locations moved the axle either fwd or back about 1/8-1/4" I cant remember which way. The front hanger has 4 predrilled holes and depending on which one you use determines the axle movement from stock location.