Hello, I am sending you instructions from the GM service manual on the hinge pins. You did not say what model truck, "C" or "K", but GM recommends removing the door from the truck, not like the old ones. Thanks, Bob

Front Side Door Hinge Pin and Bushing Replacement

1. Remove the door.
2. Remove the hinge pins from the body side hinge by grinding the bottom end of the pin off and driving out the remainder of the pin using a hammer and punch.
3. Remove the old bushings from the door side hinges.

1. Install the hinge pin bushings (1) into the door side hinges.
2. Install the shorter hinge pin (3) into the bottom hole in the body side hinge.
3. Install the washer supplied in the kit and a standard 5/16 inch x 18 nut onto the replacement hinge pin.
4. Tap the shorter hinge pin (3) into the hinge as far as it will go.
5. Tighten the 5/16 inch x 18 nut with a hand wrench, drawing the hinge pin into the hinge until the pin is fully seated.
6. Replace the standard 5/16 inch x 18 nut with the lock nut supplied in the kit and finger tighten.
7. Tighten the lock nuts.

   Tighten
   Tighten the nuts to 19 N·m (14 lb ft).

8. Install the longer hinge pin (2) into the top hole in the body side hinge.
9. Install the washer supplied in the kit and a standard 5/16 inch x 18 nut onto the replacement hinge pin.
10. Tap the longer hinge pin (2) into the hinge as far as it will go.
11. Tighten the 5/16 inch x 18 nut with a hand wrench, drawing the hinge pin into the hinge until the pin is fully seated.
12. Replace the standard 5/16 inch x 18 nut with the lock nut supplied in the kit and finger tighten.
13. Tighten the lock nuts.

    Tighten
    Tighten the nuts to 19 N·m (14 lb ft).

14. Install the door.
15. Lubricate the hinge pins with Goodwrench® Super Lube or equivalent.