It's a CV styly DS in the front. Apparantly a known weak point on the 99-00 model WJs. The rubber boot on the TC end had rotted off, possilbly for quite some time. The water holes at Aetna washed out the last remnants of any lubricant that were in the joint. On the way home, it started making an awful humming sound with vibration. I did make it home though and found the issue. I'm running 2wd right now. I think I am going to order a new double/doulbe cardon shaft from Tom Woods.