Ok so I was browsing craigslist and seen a 2006 silverado. I know a lot about the silverado's through 2003. I know my aunts fiance has a 2008 silverado and it has a button to push that says M for manual so when he is hauling his trailer he can switch to manual. But I would like to know how it works on this truck because you shift into manual with the gear shift not a button. Just kinda wondering how that works. Thanks
