Help front diff problems

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Hi guys this is my first post but I was reading other post and this forum seems the most knowledgable out of any I've seen. I have a 1996 explorer v8 awd. I was on the high way to and the front end felt funny and started pulling hard to the right. At first I thought I had tire going soft when I pulled over the tire was fine and I could see smoke coming from my front diff. I stopped forms while let it cool down and the car drove fine but when it began to heat up it started to make a loud humming and began pulling again. I got the truckhome and saw oil all over the diff it was leaking from the front driveshaft ad the left cv. I opened opened the filler plug amd tried to suck out the old fluid but all that came out is smoke. I added a heavier gear oil amd the truck seemed fine for a little whole but started doing the same. I think my front diff is defiantly shot. I am picking up a junkyard diff tomorrow. Is there any other problems I should look out for. Thanks