What should I look for on the springs shackles and U-joints. I did grab the rear drive shaft, yanked and rotated it and it felt tight. The front had a degree or two of rotation but very slight. How do you tell if a U-joint or shackle or spring is bad? Also, does the noisy rockers sound normal for 126,000 miles? Thanks alot. D.

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94 XJ 2 Door/2.5/5 SPD/4 WD