Mine is still leaking, but manageable since I'm not putting too many miles on it. I would prefer to do it in the near future as well. I think it would be a good idea to do both consecutively, same day.I'll need to get my hands dirty on this one. I took a look at my 80 last night and noticed a huge circle of oil underneath the rear diff. Upon further inspection, it looks like both the pinion seal AND the large main differential seal need to be replaced... I filled it with gear oil, so it is going to OTMT tomorrow morning... But sometime this fall it will need to be addressed.