You can replace the yoke:
Take a chisel mark the yoke nut and the pinion to establish a point of reference.
Count the number of threads exposed with the nut on ( example 3 threads)
Have new yoke and seal ready
Remove nut using impact gun.
You will need a pulled sometimes a harmonic Balencer puller will work. Pull the yoke off the pinion.
Take a flat head screwdriver, chisel, or seal remover and remove the seal. ) there will be loss of gear oil here so a drain bucket is needed.
Put a little grease on the back of the seal to keep the spring from falling out of the seal also a little on the riding surface.
Tap seal into place carefully not to damage it if you have a bi socket or seal driver set use that.
Take the new yoke put some rtv silicone on the spines on the end that the seal rides on ( prevents oil from seeping through spines causing you to think you have a pinion seal leak)
Apply read loctite to the pinion threads and to the pinion nut slide yoke onto the pinion.
Put the washer ( if separate from nut ) on tighten the retaining nut to line up your 2 chisel marks. Spin yoke a few times then tighten just a 1/16 to 1/8 more than your mark.
Done.
This is how I've been doing pinion seals on vehicles for a long time there may be other ways others do it this is what I prefer.
Any questions just PM me