The explorer axel pinion is offset by 2.75" to the passenger side. In order to get it to line up in the center of my car I had to cut 2.75" off of the drivers side and reweld. A little trick I learned from the jeep guys. I paid 250 bucks for the axel at my local scrap yard, the axel is 31 spline, 3.73, with posi straight from ford. Pretty cheap alternative compared to going with a 9"