Hey, when you click on your own name, you automatically go to your Profile Page. When there, you can easily search for posts made by you.
Go here to see every post that you've made on the site, and you'll see your post.
I think this is your thread: http://www.gmtruckclub.com/forum/showthread.php?t=15595
(I had to turn on your Visitor Messages (that's what this is) becuase you have turned everything off in your profile. You can re-adjust your settings in the USER CP button at the top-left of the screen.