the shackle flip and axle floped on top of the springs sets it right up for caltracs and lowers the truck 4-5 inches,it will give a nice drag truck stance,ride much better.

a few of the high HP trucks are running the flip flop,I did mine this way after seeing member 'clutch' blue drag truck with a wheels up launch.

very ez to do and uses all stock truck/car parts.

hers a shot of the shackle flip,you use a set of front spring hangers on the back,use car shock plates and u-bolts,wagon shocks...and now would be the time in your build as it apart and ez to get at.