[oldandtired]

If I understand your question, if you remove the bail and the light switch/clip at the bottom of the horn rod down by the steering box the horn rod should pull out enough at the top to remove the horn button without having to completely remove the rod. You do not want to separate the rod from where it attaches to the horn button plate if you can avoid doing so. You do not want to bend the horn rod in an effort to remove it with so little room in the pickup cab. I have tried removing the entire tube without doing what Sparky suggests and I ended up still having to follow his procedure so I could replace the tube I rendered useless.