My shields are falling off

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Engine Shield: GM Part Number 15819134
Oil Pan Skid Plate: GM Part Number 15094870
Shield bolts from front to rear:
Engine Shield Front Bolts: M8x1.25x30 (GM Part Number 11609733)
Engine Shield Rear/Oil Pan Skid Plate Front Bolts: M8x1.25x35 (GM Part Number 11589407)
Oil Pan Skid Plate Rear Bolts: M8x1.25x30 (GM Part Number 11609733)

Torque for all engine/trans shield/plate bolts: 20 N?m (15 lb ft)

Transfer Case Shield: GM Part Number 15091301
Bolt: M8x1.25x25 (GM Part Number 11515757)

Torque for transfer case bolts: 30 N?m (23 lb ft)


All bolts are rated 10.9 (medium carbon/carbon alloy/carbon boron steel. Rockwell Hardness: Min C33/Max C39.