Son, your ego is writing checks your body can't cash.
Seriously, though, at the very least, you'll also have to replace the BB, if you have indexed shifting, or you'll more 'n likely have chainline issues. http://www.sheldonbrown.com/chainline.html
I've seen your other thread about buying this Cross Check. My .02, because I didn't offer it up on the other thread:
I bought one to replace my road bike - Specialized Allez Comp, and I couldn't be happier. It's responsive and rugged and comfortable and pretty gosh darn fast. I have a hard time feeling a huge difference between my Allez and my Cross Check (okay, so I'll admit I'm not a racer or weight weenie). It is first and foremost an awesome commuter. Period. It's also bombproof, once you've frame saver(ed) it. I haven't toured with it, but I plan to and I think it'll work very well for that too.
BUT!!! I do want to say that I bought one that many would consider to be too big for me. Here's why:
I bought a 62cm, almost the largest size they offer (and maybe the largest complete size they offer). I'm 6'1", just to let you know (so not overly tall). This not only, according to Rivendell, and my own experiences, provides a more comfortable ride, as I don't have to be quite so stretched out (because the seat is down more, and therefore not back as far - check it out!), but the larger size also provides more of the precious chainstay length that everyone debates about so furiously when deciding between the LHT and the Cross Check. Also, and I know this from experience as well (because I bought a 56cm 'Check first) that with the smaller frames that maintain the 700c tire size, toe overlap with the front wheel could be an issue as well (it definitely was with 44 tires). That issue completely
disappeared with the 62cm.
Okay, I hope any of this helps. Good luck. I think you'll love the Cross Check. I certainly do. However - because it is the supreme "do-all" bike, you might feel like you're sacrificing in certain areas. These sacrifices will become less and less noticeable the more you own it and ride it (and, frankly, the less you read opinions about it here on BF - there are enough of those on this site to render any rational person unable to make a decision) When it comes down to it, people have commuted, toured and raced on almost every type of bike you can think of. If you love the bike, who cares what it was originally "supposed to do?"