I'm going to be taking apart the CEN 3-spd trans to make an alum case for it. What I need to know is, will anything drop out of the case when I split it? Any tips on taking one apart would be helpful, as well.

Where can i find this 3 speed transmission for the ct4s

Try [link=http://neweramodels.com]NewEra[/link], followed by eBay. As a last resort, [link=http://ehobbies.com]eHobbies[/link], as they are way over priced!!
BTW, the 3-speed trans that I have is from the CEN Genesis MT.

So the transmission from out the genenis works in the ct4s

I didn't say that. The 3-spd trans that I was refering to is for the Genesis. Didn't mean to mislead ya. Sorry. I'd still go with NewEra over eHobbies, tho.