SEL light discussion (what's causing it?)

[kmeleon]

I also wanted to say, that I too used to feel shaking driving at a constant speed. That is gone too it seems. So others that are feeling that, ask your dealers to do this update. So far it's been great. 

[usmcav8or]

What are the exact windows for the valve springs and lifters, and how did you check to see if your truck fell in those windows?