Just a comparison of the wheel bearing adjusting nut spanners for these axles. It suggests the differences in their bearings, spindles, & axleshafts.

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I had known since before I bought it that the RHF u-joint was shot, but it wasn't until the first long trip that the condition of all the others became apparent. So I changed all 3 to new Spicer Life series 5-1350X sealed u-joints like original. It took longer than I expected because I found a few other things to fix along the way, including all the other U-joints (front d'shaft Spicer Life series 5-760X sealed u-joints; rear d'shaft Spicer Life series 5-1350X sealed u-joints).
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The spindles have been off before, but their bearings & seals are still OK, so I didn't change them then or now. But I did tape them off & then sandblast the rusty areas of the spindle, polish the seal surfaces, paint what had been rusty, and painted the pilots (that commonly seize in the steering knuckles, resulting in the chisel marks) with graphite-bearing paint (EZSlide).
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Axleshaft to spindle seal filler (small) National 722108
Axleshaft flange to spindle flange (large) Spicer 50381
Kit Spicer 706527X

Some of the u-joints that had seemed OK the first time I checked them were almost as bad as the one I knew needed replacement. Many of the C-clips were rusted in-place & broke, and some of the u-joint caps were rust-seized.
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Before removal or disassembly, all the driveshaft sections & flanges were cleaned & marked for proper alignment during assembly. While disassembled, they were sandblasted & painted.

To make future service easier, I added a rear drain plug to the front chunk.
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Another mod I always make is swapping the PITA E-ring to a fabricated snap ring, like modern CV shafts use. The shaft is still positively retained in the chunk, but it can be pried out without breaking the chunk off the axle beam. I bent the snap ring from an old D-cell battery spring.
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During this process, I also swapped the flexplate & trans pump seal.
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During this process, I also swapped the flexplate & trans pump seal.
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I replaced both front axleshaft seals using Hylomar Blue, and sealed the chunk using MotorCraft gray silicone.
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Left (green deep) seal Dana 40710
Right (red shallow) seal National 470672
RHS axle seal Spicer 40773

Both driveshafts got sandblasted & painted, and the mounting surfaces at each end got cleaned & painted. The driveshaft alignment marks are both stamped & painted yellow.
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The rear driveshaft takes Spicer Life series 5-1350X sealed u-joints at both positions. Spicer 3-70-28X Bearing Strap Kit was not needed at this time.

Energy doesn't list a pivot bushing for Dana 50IFSs, but the bushing for a D44IFS Energy 4.3133G fits perfectly.
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It looks almost like I haven't done anything, but the drain plug is a subtle hint.
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