Guys let me start off by stating I am not very mechanical but I have a friend who is. My front differential in my 2003 Bravada is leaking. I know it has 3.73 gear ratio GT4..I am having a difficult time finding a compatible used replacement.. The differential is still in the vehicle. Everything I read talks about different mounting holes above or below the yoke. Very confusing to a novice like me..I seen some used differentials listed on eBay.I finally found a number and called.The sales person said that the 2003 bravada has 2 mounting holes above the yoke and 2 below it.Anyone know if this is correct? Also can someone help me with some other years and vehicle that is compatible.Thanks so much..