driveshaft problems Options

[zacd]

okay well now that im thinking about it, the last time i dropped my tranny out of my car, while pulling out the driveshaft the (cv joint?) seperated from the shaft on the drivers side. i think its called a cv joint, but its that green block. but basicly that thing stayed in the trans while pulling the driveshaft away. and then i ended up prying that out. it was pretty loose and whatnot, but i was too anxoius to mess with it so i put just shoved it back in and the driveshaft locked w/ it just fine, but im wondering if this is a bad thing. i think there is ball bearings in there right? well i dont know, but i just wanted some opinoins on if that is ok the way it is or if i'll have to take it out and replace it or whatever...if i get a transmission.