I need help and I'm knew to the forum. I've had a dana 35 in my jeep since I got it 12 years ago when I was 15. I'm fiscally in the ball Park for a Dana 44! Woot! A guy is selling one about an hour away that he says came from a 99 wrangler. But it has a rubber plug and this weird thing that looks like it bolts onto the top of the housing. What is it?! Btw, he wants $325. It also has a limited slip in it. 132,000 miles owner doesn't know if there has been previous work done to it. He's just parting out.