So my 700r4 tranny has cracked twice now. Once on the passenger side of the bell housing, which I got welded up due to lack of funds. Then shortly after the tail housing split off and dumped all the oil on the highway. Pretty certain the tranny is pooched now but I looking for what's causing this. I had a vibration, I checked it out before and the tail broke off and seen my yoke on my rear diff was a little worn so I replaced it but the next day it happened. I'm trying to figure out why. Best idea I have as to why is maybe my driveline angle is fucked, this truck originally had a th400 with a two piece shaft and a 10 bolt rear but I have basically changed everything on it. I built a 385 stroker motor for it putting about 450 horse out. As well I have put in a th350, and a 700r4 in it and changed the rear end to a posi 12 bolt. What I am thinking maybe is that 12 bolt was out of a 4x4 and I have a 2wd so maybe the diff sits at a different angle or something of the sort. If anyone has ideas as to why this is happening would be much appreciated. Thanks.