The first step is to remove all parts connected to the front side door and mark the area around the current hinge on the hinge pillar and only after that remove any excess adhesive there. Run the sandpaper across the hinge by hand to find the four spots that attach it to the pillar and then puncture the center of each of these spots to prepare for effective drilling. Make a center punch on each one of the four old weld marks, but do not drill into the door (1). Use a 13 mm rotabroach hole saw or its alternative to cut through the hinge base (2) at each position, then chisel away the hinge if it is stuck. Wash the area around the door to allow for a right fit of the hinge and then mend all the damage done while removing it. Get the hinge mounting areas of the backing plates ready, fit the hinge onto the scribed marks and carefully mark each hole location on the door with a center punch. After placing the center punches, make a 3 mm (1/8 in) hole at every spot, then drill out each 3 mm hole to make it 11.5 mm (29/64 in). Wash all the exposed metal areas, coat them with an acceptable anti-corrosion primer and seal the hinge area with full-bodied caulk. Place the hinge on one side and the backing plate on the other side of the door, thread in the bolts and tighten them to 25 N.m (18 lb ft). Non-stick sealers should be used on the metal and all necessary panels and components should be refinished; after which, everything is reinstalled and adjusted correctly. Installation of new doors also requires the same steps: first remove all the door-related panels, clean off any old adhesive, sand the existing hinge and mark the spot. Punch the weld marks, use a 13 mm (1/2 in) rotabroach to drill through the bottom of the bed (2) and then detach the hinge. First, clean the surface of the pillar, deal with any issues, put on the service hinge and use center punches to find each stud location. First drill a pilot hole of 3 mm (1/8 in) and afterwards make a hole of 11.5 mm (29/64 in) for the studs. Clean the bare metal sections, treat them with anti-corrosion primer and insert fish wire (1), GM P/N 15017229, both through the hinge and the pillar. Take the stud (2), GM P/N 15017230 and insert it into the wire end, align it properly and finally mount it with the provided nuts GM P/N 11516746. Do the same for all the rest of the studs, remove the nuts, apply caulk under the hinges where they attach to the frame, connect the hinge (2) to the pillar (3) with the supplied nuts and tighten using 25 N.m (18 lb ft). Make surfaces clean and fit for refinishing, coat them with sealers and put back all the panels and components.