Welcome to the forum!!!
Since you are all stock from your profile lets start with the basics. U-joints on the driveshafts need to be inspected closely to see if they are installed properly and not coming apart. You may have to drop them out of the diffs to check closely. You can drop the front shaft first and drive it and if it goes away its the front shaft. One of the driveshafts may have thrown a weight. Then look at your motor mounts and see that they are not separated and then the trans mount and torque arm are solid on the T-Case skid. From there I would shake down the suspension components and see if some thing has come off or broken as in shock mounts and shackles.
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