It's not hard to find at all. CV joints are only in the front when you're dealing with a front wheel drive vehicle
Just look at the drive shafts going from the tranny to the knuckles. There's a great big rubber boot in the middle of them covering a joint. I bet you money that the one on the driver's side is cracked and there's grease all over the bottom of your engine from it spinning out.
Basically what this means is you're likely going to have to replace the drive shaft. I'm 95%+ sure that I'm right here.
BTW, this is one of the many reasons to do your own oil changes. The last half dozen guys that changed your oil had to of looked straight at this without saying anything. If you catch the boot before the joint is damaged you can replace the boot and save the shaft if you're so inclined.