An adjustable wrench would not work on the carrier bearing nut. Two main reasons:
1) the nut is located down inside the yoke, so socket is required. No access for other type tool
2) the torque is very tight like 150-200 ft lbs. Add in some road grime and maybe corrosion, and you can see a real socket is required.
On mine, it required an impact gun and some work to get it loose. The U-joint is just small 5/16 or 3/8 size bolts, that could certainly be done in the field with normal tools you carry with you - provided you have the parts of course. The carrier bearing is also kind of press fit for the bearing ID on the shaft, you need a puller or as the guy did for mine, used a cutoff wheel to cut through the bearing.
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