So I was having some noise from the front of this new to me 1992 xj. After some investigating I found that the front left axle shaft U joint was basically non existent. While investigating I didn't think the front drive shaft U joints seemed bad at all but after fixing the axle shaft joint I still had an odd noise similar to slight grinding noise coming from the front end. I figured I'll just remove the front drive shaft and if the noise goes away then that's the problem. Well, the noise went away but now where does that leave me. What could be making noise in the driveshaft besides the seemingly good u joints? Do I just start replacing the u joints in the driveshaft?