hey i got a leak arouind my transfer case i think.its throwin around oil ..i dont know if i have to unbolt those bolts in the picture and change out a gasket or if its more involved than that..any help would be great i dont wanna go screwin things up ..thanks
b

 

Looks like the outter seal. You have to take the driveshaft off then take that big nut off to pull the yolk out of the way. Also if its a 203 case I've seen where that yolk itself will have a hole in the middle. Either weld it or fill it full of silicone if that's the case