Top photo with oil dripping off the bellhousing is more likely the rear arch area of the upper oil pan, not the rear crank seal (but using a mechanics mirror there's a method to get a better idea of the source).
If the leak is from the upper pan both oil pans need to be dropped
to reseal them. Mechanic might charge you ? $500-1000 (dealer pricing) for that.
The grunge and fresh leaks on the front axle housing are a few things going on
at the same time: When the oil filter is removed half of the oil inside drips
down onto the axle housing. The older build-up of oily grime is likely
from the oil pump cover, about 10+ years worth. The leakage from
the oil pump cover is easier to see if you remove the splash pan under
the radiator then wash the front (not the top) of the engine off IME.
if you look at the swivel balls at the ends of the axle housing, where the steering knuckles are located, there is a pretty good build-up of grease and the one ball in the photo looks dry. So I would ask if the CV joints, axle seals, etc have ever been pulled out and serviced. If not, it is past due. Cost to pay someone to do that, around $1500 +/- depending on who does it and if any hard parts are needed. You could do it yourself for a third of that, depending some on what tools you need to buy. In the meantime you could clean the knuckles off (by hand) then pump a tube of Valvoline Palladium (NAPA) or similar grease into each knuckle and run it.
Overall, appears typical for an 80 that hasn't had the usual preventive maintenance, otherwise looks good, no rust. As soon as (if) you clean off all the free "rust-proofing", the rusting will start.
(Tip: don't blast the swivel balls/knuckles with high pressure soap/water at the car wash; the old wiper seals might allow water to get into the knuckles. Only do that the night before you start the complete front axle service, IMHO.)
