Your inner CV joint is out. I'd reccommend wiggling it to see if you can get it back in. You'll have to push hard. Search and you'll get some more info. If that doesn't work, rebuild the whole axle. It's not a bad idea to put fresh boots on. Get a boot kit from Autozone for each joint, and two tools: pair of snap-ring pliers, and a pair of CV boot clamp pliers. Then do this:
Cut off the old rings/boots. You'll see the problem right away. The bearings won't stay on the tripod, so take them off. Use the ring pliers to get the one behind the tripod. Pull it back (it's tough) and slide the tripod back until you can get to the inboard snap ring. Pull that off and slide off tripod and rings. If you didn't cut the boot, pull that off too. Hack off the outer boot, and wipe away all the dirty grease. There will be a lot. Make sure you don't get any dirt near the joints. Re-grease the outer joint and slide the new boot down over the axle shaft. Clamp on the new rings. Back to the inner: slide on the new boot, then the heavy snap ring, then tripod. Get the heavy ring on far enough to get the little one on, and then slide the tripod out over the little ring, and click the heavy ring into place. Put the bearings back on and slip the whole assembly back into the housing. That's going to take a little cordination. After it's in you'll get the ball joint lined up: hooray! Now pack the joint with grease and boot it up. Test drive!
