I can't speak to the potential tranny problem - But...

My CVs are shot. I replaced the boots because they were torn. While I had them apart I noticed the wear but it didn't look too bad. I get a loud 'tapping' sound when decelerating but it's not bad enough to feel it.

I found a place online to purchase rebuilt axels (as near as I can tell, you can't get the parts you need to just replace the CVs) and I'll be ordering them later this week. They are about $75 per side with another $75 core charge.

Look at your boots. If they are torn, you probably won't be fixing it by Thursday. If your boots are OK and you can get the tranny serviced then you should be all right for your trip - it just depends on if you are a gambling man.