How do you install the key cylinder on a 78 Chevy pickup?

Answer 1

assuming that you're talking about the ignition cylinder on the steering column: you remove the horn button from the steering wheel, remove the safety snap ring from the main steering shaft, then the nut (most likely a 13/16 socket). then you buy or rent a steering wheel puller, remove the steering wheel. after the wheel is removed, you'll need to pry the black plastic cover from the wheel lock ring, which is what locks the steering wheel when the key is in the off or lock position. you'll need to get another tool now, to hold the lock ring down against the spring about 1/4 inch, while you remove the small outside snap ring from the groove in the steering shaft (pry it out of the groove with a small flat screwdriver). once the snap ring is out and the lock ring is removed, remove three Phillips screws which hold the turn signal switch in place, and pull it out and down over the shaft (leave the wiring harness attached, and let it hang down while you change the lock cylinder). now turn the ignition switch to the run position, remove the screw that holds it in the column, and pull the switch (cylinder) out. reverse procedure to re-install new cylinder.