QuestionI have a 1978 Custom Deluxe that has the ignition stuck in the on pos.I was wonder how hard it was to fix and could I do it myself.
AnswerHi William
Sorry about your situation. The ignition lock cylinder needs to be replaced and yes, it's fairly tricky.
We have recently uploaded pages and a description of how to replace the lock cylinder on GM vehicles. They are broken down into step by step detailed instructions. Here is a link to that page.
http://www.stolenandrecovered.com/howto/gmcyl.php
Lastly, I would have a new lock cylinder in hand before you begin, to see what you are working on (hidden in the column) and accomplish finishing this job quickly.
Good luck
Doug
http://www.stolenandrecovered.com