Ok so it's been just a little over 2 weeks since I rebuild the internals of my differential. Replaced the carrier (8.8 trac lok), ring and pinion, pinion bearing, and all the other various bearings. Everything has seemed to be functioning properly with no issues until Saturday afternoon. I went to Wichita which is about an hour from where i live to stay the weekend with the girlfriend and after a running a few errands we returned home and I noticed a smell that seemed awfully familier. I thought to myself "Hmmm, I know I took all those parts out of my trunk so where does it smell like I have a trunk full of greasy differential internal parts?" WELL, my heart sank as I realize it must be coming from underneath so I slowly sank to my knees and proceeded to bend down to peek under the car and that's when I saw it. A crack dead center in middle of my differential cover and fluid running out at a surprising rate. I couldn't believe it. I have no idea how this could have even happened. I have snapped a ring gear and crumbled a pinion gear inside of a casing once before on a Ford Torino and nothing happened to the casing. I don't get it, I am thoroughly confused. So anyways I drove the girlfriends car the hour to work this morning and will this afternoon be figuring out how to haul my car the hour back home so I can begin to figure out the hows and whys. Anyone else ever had this problem or seen it happen? Anyone got a extra diff cover lying around? Lol