When this was me, I replaced the axle seals without dicking with the pinion seal. With the axle shafts out, cleaned the grease off the axle shafts, then I drew a "relatively" straight line from just behind the bearing area to just ahead of the splines on each shaft using a white paint pen. That'll tell me if I ever twist an axle shaft. Which will never happen, but what the heck.
Verify the bearing and seal area of each axle shaft. As the shaft is the inner race for the bearing, it has to be "perfect". The seals will wear a groove into the shaft over time. If the groove gets big enough, it'll leak. I haven't looked to see if they make a repair sleeve for the seal groove. Probably not--it'd be a bytch to install.
You must be registered for see images attach
You must be registered for see images attach
You've got the pin out to remove the C-clips. Make sure the pin isn't worn, and that the spider and pinion gears in the differential case aren't wiped-out. This pin, and the gear are "done".
You must be registered for see images attach
You must be registered for see images attach
My pinion seal wasn't leaking. Figured "sleeping dogs" could go right on lying.
I spent too much time spinning one axle shaft, to see if the G80 would lock. It did, reliably. 'Course, I would spin the one axle shaft fast...slow...half-fast...three-quarter fast...trying to see how much it took to get the G80 to lock. That was fun for about half-an-hour but it didn't accomplish anything useful.
Then I installed Amsoil gear lube with "posi" additive already in the oil, which made the G80 slip so bad it was useless. Drained the Amsoil in favor of Valvoline with NO "posi" additive...twice...before I had any indication that the G80 was working again. MOST gear lubes have "posi" or "limited slip" additive already blended-in; my advice is to avoid those in favor of the stuff that does not have additive. Or get the "smells like grape-juice"
special gear lube direct from GM, which costs an arm and a leg.
Replacing the wheel cylinders is a fine idea, as is welding-up/grinding down any grooves the shoes have worn into the backing plate pads.
Beyond that--usual brake job stuff. Might as well bend-up new brake hydraulic tubes from the outlets of the brake hose to the inlets of the wheel cylinders.
You must be registered for see images attach
Continued below. At the limit for photos.