My 1996 seems to be leaking from pinion seal, is this expensive to fix?

I have 250,000 miles on my 1996 2.4 Tacoma with the 5-speed. Got oil all over the rear axle. Can't tell if it's the pinion seal or the differential cover gasket, but the main oil drips seem to be coming from the front of the axel by the drive shaft. Damn, I'm broke and I can in no way fix it myself with my health stuff going on.

Has anyone had this happen? How many labor hours am I looking at to change the pinion seal?

How many labor hours in changing the differential gasket?

Any mechanics out there can tell me a rough estimate of what cost I'm looking at? Thanks.

 

Pictures might help.

 

Between 1-1.5 book hours.

 

Thanks. I also just found out it could be a blocked vent tu e at the top.

 

A blocked vent tube is a new one on me. If I was 20 Id crawl under there and do it my damn self