Universal Joints, 2 in the front axle, 2 on the front driveshaft, and 2 on the rear driveshaft. Go to utube and watch the videos for replacing u-joiints. If you have a lift with an sye you may have a rear driveshaft with a cv joint or a double cardan joint. U-joints are reatively easy after you have done one or two and a DIY project with simple tools and a BFH.
89YJ 2.5L TBI, AX-5, NP231 SYE, Ford 8.8, Yukon Grizzly, Tom Woods Shaft, 33" BFG T/As, 4" lift, Warn VR10000s.
AF Jeep Club Tail #184