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I replaced the ignition cylinder (switch) on my '87 which is basically the same truck. It was pretty simple once I used a steering wheel puller to remove the steering wheel . I don't remember exactly how it was done but I followed the instructions in the haynes manual to remove the steering wheel column cover. There were a few lock rings and bolts to remove but it was pretty straightforward. Sorry I can't give any more detailed instructions.

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Q: How do you remove and replace the ignition cylinder in a 1978 GMC truck?
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