What was found
GROUND SHIFT FAILED AFTER TAKEOFF, UNABLE TO RAISE GEAR HANDLE, AUTO PRESSURIZATION INOPERATIVE. TAKEOFF WARNING HORN SOUNDED. RAN ABNORMAL. PULLED GROUND CONTROL CIRCUIT BREAKERS. SYSTEMS RESTORED. AFTER LANDING, AND NOSE WHEEL TOUCH DOWN, A LOUD POP WAS HEARD AND THE NLG REPEATEDLY SHOOK FROM SIDE TO SIDE. FOUND NOSE GEAR TORQUE LINKS NOT CONNECTED. RECONNECTED AND OPS CHECKED GROUND SHIFT IAW DC-8 MM 32-23-01. SWUNG NOSE LANDING GEAR FOR RETRACTION CHECK IAW DC-8 MM 32-20-00-05. OPS CHECKED GOOD.