The dana 30 front does not have a plastic/rubber fill plug, it has a metal one just like a dana 44 rear. It also has a different bolt pattern than a dana 35. So unless you have a rubicon or someone was drinking that day on the assembly line you have a dana 30 front. A picture would also help.
I know a lot of things, most of them are only correct in my own head...
Better to be judged by twelve then carried by six. I'm sure this is going to get me in trouble down the line
2000 sport, 5speed, 1-1/4 body lift, 3" zone, metal cloak front fenders, metal cloak control arms, 4.88, 35" cooper stt.