Pinion seal?

[bluex]

I'm losing gear oil out the front of the diff. I'm assuming that its from the seal on the pinion shaft? Can I change this without removing the pinion? If I have to go that far I might as well go ahead and swap out my gears. I helped my stepdad make a run to the landfill and by the time I got home I'd lost all the fluid. It just started making a awful noise on deceleration/coasting. As long as I was on the gas it was ok.

I cant win with this truck, I was trying to keep it torqued up to keep the gears engaged while I was slowing down and wound up flooding it majorly to the point that the plugs were full of gas when I took them out. I thought I had screwed the carb, but after about 3 hrs. it fired up and I drove it back home. I think that is going to be ok, but I need to get the rear fixed now before I can drive it anymore.