5.3 & 6.2 LITER. Trans mount nut. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Suspension Crossmember Reinforcement. Automatic Transmission Mount Nut. Bumper Impact Bar Nut. Engine Cradle Nut. Radiator Support Splash Shield Nut. Seat Belt Lap and Shoulder Belt Nut. Suspension Crossmember Nut.