Synergy 8024-30/8024-40 - JK Synergy Stage 4 Long Arm System - Manual (Page 5)

d) Grind the cut edge off of the remaining part of the lower control arm bracket on
the inner frame. Do not remove this section of the factory lower control arm
bracket. You need retain the two layers of brackets welded to the frame for the
proper spacing of the new control arm brackets.
e) Cut off the upper control arm mount from the frame