Hello Im new to the site... I have a 70 SS clone with a stock 350 and 10 bolt rear..I just noticed fluid leaking pretty well from the yoke in the rear that connects the driveshaft..Iwas wondering what the easiest way to fix this is. I plan on putting a true 70 SS 12 bolt posi rear I already have in the car this winter so I dont want to get too involved with this 10 bolt. Any help would be greatly appreciated.

First make sure it's not the cover gasket that's leaking. A gasket leak will allow lube to go forward and drip off the pinion flange area just like a pinion seal leak. If you're sure it's a pinion seal leak, do a search here on TC. It's been dicussed at length in the past.